The coronavirus pandemic has made the transfer market uncertain -- and you can find out when the windows open and close here -- but here are the rumours floating around Europe's big leagues and beyond.
TOP STORY: PSG going in for Messi
Any club in the world would want Lionel Messi, and Sport in Spain has reported that Paris Saint-Germain are one of the few who have decided they can pull a move off -- presuming he is allowed to leave Barcelona.
Sources told ESPN earlier this week that PSG were monitoring the Messi situation, and that the Barca star has even chatted with Neymar about reuniting in Paris, and Sport now says the Parisian club are going to step up their interest.
The Argentine's wages will be of no concern to the Champions League finalists, though if a fee is required, they will need to sell before signing him to satisfy Financial Fair Play regulations.
However, La Liga have backed Barcelona's contention that Messi's €700 million release clause must be paid if the player is to leave the club this summer.
22.35 BST: The reported rumours of Thiago making the switch from Bayern Munich to Liverpool have been well documented, but what about Manchester United's chances? ESPN's Gab Marcotti explains why it could happen:
Can Man United snatch Bayern's Thiago from Liverpool?
Gab Marcotti explains the reasoning behind Manchester United's interest in Liverpool target Thiago.
According to Goal, Leeds are in talks to sign Argentina midfielder Rodrigo De Paul for Serie A club Udinese, with a €30m fee being the sticking point. De Paul is on the wishlists of several other Italian sides, but Marcelo Bielsa is keen on bringing the player to Elland Road.
Having spent the previous four seasons as the backup shotstopper at Manchester City, Bravo is now on his way to the city of Seville on a one-year deal. The former Real Sociedad and Barcelona player will link up with compatriot Manuel Pellegrini, who takes over as Betis' manager ahead of the new season.
Bravo's contract includes option for a second season. He'll certainly bring a championship mindset to Betis, after winning several league titles with Barca and City.
21.00 BST: Major update from Manchester United's pursuit for Ajax midfielder Donny van de Beek. Sources have told ESPN's Rob Dawson that the teams have agreed on a £40m deal for the Dutch midfielder's transfer to Old Trafford.
Sources have said that United boss Ole Gunnar Solskjaer and the club see a deal for Van de Beek as a good opportunity to strengthen the squad in a window during which they have struggled to agree a fee with Borussia Dortmund for Jadon Sancho. At around £40m, Van de Beek is seen as reasonably priced while at 23, he also fits into the right age bracket for Solskjaer's rebuild.
The Chilean veteran is one of several players who may be leaving Barcelona and he said he would be "very happy" if he returned to Juve, where his former teammate Pirlo is now manager.
"If he or Juventus call me, I would be happy, Vidal told Daniel Habif in an interview. "If it happens, it happens. I have a lot of affection for Juventus and for Andrea."
How a 33-year-old Vidal would fit into Pirlo's newly restructured midfield would be the main question, as the Serie A champions have already signed two midfielders this summer in Arthur and Weston McKennie.
"Finally everything is in place and finally I can return to where I feel at home,'' Ibrahimovic said upon his arrival at Milan's Linate airport late Saturday.
The 38-year-old Ibrahimovic is expected to sign a one-season deal worth €7m. Ibrahimovic began his second stint with Milan in January on a six-month contract and helped turn the club's season around with 10 goals in 18 Serie A matches.
"As I've always said, I'm not here to be a mascot. I'm here to bring results and to help the team, the coach and the squad return to where Milan should be,'' Ibrahimovic said in a video on Milan's website.
18.54 BST: Fabrizio Romano is reporting that AC Milan are in advanced talks to sign Sandro Tonali. The side have allegedly submitted a €10m loan bid to Brescia with a €20m option to buy alongside a percentage on any future deals involving the player. AC Milan are pushing for the deal to happen after Inter Milan moved their interest elsewhere.
Harder, 27, has long been linked with a move to the London side where her partner Magdalena Eriksson is the captain. The prolific four-time Bundesliga winner, who scored 27 times in 22 league games last season, has 105 goals in her three years at the club and will aim to earn her first Champions League winner's medal on Sunday.
17.01 BST: Everton defender Michael Keane has signed a new five-year contract, the club said on Sunday. Centre-back Keane, 27, earned a recall to Gareth Southgate's England squad this week and capped a memorable few days with a new contract to keep him at Goodison Park until 2025.
"I have loved my three years at Everton and am looking forward to seeing what the future holds," he said. "The manager [Carlo Ancelotti] is one of the best there has been. I am not happy just staying where I am at the minute. I want to keep improving and keep learning."
The five-year contract would also include an option to extend for a further year. The salary is expected to be around €3.5-4m per season plus performance-related bonuses.
15.46 BST: Manchester United are favourites to land Ajax midfielder Donny van de Beek, sources told ESPN's Rodrigo Faez and Alex Kirkland on Saturday. The 23-year-old has featured for Ajax in preseason but was left out of their squad for a friendly with Eintracht Frankfurt.
Belief at Man United that Donny van de Beek represents a good opportunity in a difficult window. Right age bracket, wants to move and price not extortionate. No bid yet but interest is there.— Rob Dawson (@RobDawsonESPN) August 30, 2020
14.54 BST: Arsenal's Ainsley Maitland-Niles was named man of the match in Saturday's Community Shield victory over Liverpool, but his future is very much in doubt as he wants regular first-team football. The Sunday Telegraph says that Newcastle United are considering making a move but the £25m asking price is putting them off.
We also heard on Saturday how Newcastle are expected to sign Rob Holding on loan from the Gunners, who also played at Wembley.
14.23 BST: The Mail on Sunday reports that Aston Villa are eager to re-sign Tammy Abraham on loan from Chelsea. Abraham starred for Villa when they were promoted from the Championship in 2018-19, but he was very much part of the Chelsea first team last season.
However, with Timo Werner arriving from RB Leipzig there could be limited opportunities for Abraham in the upcoming campaign. But the paper says that Abraham intends to stay at Stamford Bridge and fight for his place.
Spurs boss Jose Mourinho has criticised Ndombele's application several times and there seems to be no future for him. The club want to recoup the £55m they paid Lyon just 12 months ago, but Inter are not prepared to play ball on that.
12.57 BST: Eight years since they parted company and five years since he last won the European Cup, Lionel Messi picked up the phone and dialed Pep Guardiola's number.
Time will tell whether the reunion happens at Manchester City, but there are plenty of reasons to try. Not least the memories of who they were at Barcelona and the hope that they might be again. Of how happy they were and how much they achieved.
12.21 BST: Jack Grealish to Manchester United? Yep, that old transfer rumour has reared its head once again, this time in the Mail on Sunday. The paper reports that United have opened talks with Aston Villa as they look to push through a deal ahead of the new season. Villa are said to want £80m if they are to part with Grealish.
11.45 BST: ICYMI ... Juventus signed United States midfielder Weston McKennie on loan from Schalke late on Saturday. McKennie, 22, has put pen-to-paper on a one-year loan deal with an option to permanently join at the end of the season.
11.08 BST: The Daily Star reckons that Tottenham Hotspur tried to offer Serge Aurier to Wolverhampton Wanderers as part of the deal that took Matt Doherty to north London. However, the Ivory Coast international is said to favour a move back to mainland Europe with AC Milan and Bayer Leverkusen both linked.
10.30 BST: Time for a Messi update! Lionel Messi has followed through on his threat and not turned up for the start of preseason as he continues to push for a move away from Barcelona. The Barca players were due in for coronavirus tests on Sunday ahead of Monday's first training session since Ronald Koeman was appointed as coach. Messi was due at 10.15 a.m. CET but did not show up.
10.09 BST: Another done deal! Tottenham Hotspur have confirmed the signing of Matt Doherty from Wolverhampton Wanderers. The deal is believed to be worth around £15m and the Republic of Ireland international has signed through to the summer of 2024.
09.30 BST: Leeds United completed the signing of SC Freiburg defender Robin Koch late on Saturday night, who Bild says will become one of the highest-paid German defenders in the game. He flew into Yorkshire earlier that day for his medical and to agree a deal which will tie him to Leeds until the summer of 2024.
Leeds reportedly paid around €14.5m to land the 24-year-old former Kaiserslautern player. Koch has two full caps for Germany and was part of the squad which finished runners-up in last year's European Under-21 Championship, losing in the final to Spain.
He was the second signing of the day for Leeds, who had sealed a €30 move for Rodrigo of Valencia in the morning.
✍️ #LUFC are pleased to announce the signing of Robin Koch from Bundesliga side SC Freiburg— Leeds United (@LUFC) August 29, 2020
Inter have change of heart in transfer policy
Calciomercato reports that this decision has been made with the hope of adding extra leadership to the squad, rather than relying on youngsters, with the likes of Alessandro Bastoni and Nicolo Barella already playing important roles for the team.
Pressure on Pickford as Ancelotti targets Romero
Jordan Pickford has made a number of high-profile mistakes, and it seems as though he may be losing the manager's faith.
If he were to lose his place, this could be a big blow for the 26-year-old's England career, with Nick Pope and Dean Henderson, of Burnley and Man United respectively, already providing him with competition.
It is Henderson returning to Old Trafford -- after a two-year loan with Sheffield United -- that could facilitate Romero's potential move to the Toffees..
- Rennes manager Julien Stephan is keen on signing Juventus centre-back Daniele Rugani, reports Calciomercato. It is suggested that they are looking for reinforcements in their back line after qualifying for the Champions League with a third-place finish in Ligue 1 last term. Andrea Pirlo is aiming to overhaul the squad having taken over from Maurizio Sarri, with Rugani among the players he is willing to let go in order to bring in his own signings.
- Marseille are hoping to sign 33-year-old Japanese left-back Yuto Nagatomo, reports Foot Mercato. In Friday's press conference, Andre Villas-Boas admitted that his side were looking to bring players in on free transfers and loans. Nagatomo will be available for free after departing Galatasaray at the culmination of the latest Turkish Super Lig campaign.
- Rennes have already identified a potential replacement for Chelsea target Edouard Mendy, as they have turned their attention to Alphonse Areola, according to Foot Mercato. The 27-year-old spent last season on loan at Real Madrid from Paris Saint-Germain, making just eight appearances across all competitions. The outlet reports that the Ligue 1 outfit are hoping to bring the World Cup winner in on loan, to help them facilitate numerous acquisitions ahead of their Champions League campaign.