January transfer window: Grading every big signing from Europe's top clubs

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Can Moussa Dembele fill Diego Costa's shoes at Atleti? (1:17)

Julien Laurens reacts to Moussa Dembele signing for Atletico Madrid and how will improve Diego Simeone's attack. (1:17)

The coronavirus pandemic made the summer transfer window very different from its predecessors but, with football back on the agenda, the January window is open as normal for Europe's top leagues.

Though clubs spent nearly €1.5 billion less ($1.9bn) in the summer than they did the previous year, according to FIFA, a number of deals were agreed in October to be completed in January (see Jan. 2). It is traditionally a quieter month, but will the global events see some different strategies for the top sides?

Here are the grades for all the major deals. The most recent write-ups are at the top; each day is in order of highest price. If you don't see a grade for a move that has been completed, check back later. All fees are reported unless confirmed with *.

Jan. 14

LUKA JOVIC
Loan

Real Madrid grade: E
Eintracht Frankfurt grade: A+

Make no mistake, Jovic has been a terrible signing for Real Madrid. Having spent €60m to sign him from Frankfurt in 2019, Jovic scored two goals in 32 games. The club kept him around as backup to Karim Benzema because they didn't want to spend anything on a replacement, but he's unhappy, out of form, and things weren't going to improve without a loan move. The fact it's back to his former club is interesting.

Frankfurt banked a massive fee for the 23-year-old and now get to have him again for nothing. His 36 goals in 75 appearances for the club are what earned him his move to Madrid in the first place and if they can help him rediscover his scoring touch then it will benefit them and the player. A year ago, Frankfurt wouldn't have imagined that Jovic would be playing for them again so soon, so it's a dream come true.

Jan. 13

TIMOTHY FOSU-MENSAH
€2m (£1.5m, $2.4m)

Man United grade: C
Bayer Leverkusen grade: C+

Having made his United debut back in 2016, Fosu-Mensah would have been frustrated at his lack of first team action. The defender has played only 30 times for the club in four years and had spent time on loan at Crystal Palace and Fulham without setting the world alight. Time to move on.

Leverkusen haven't paid much to sign the 23-year-old and he's a versatile addition who should do OK. The Netherlands international isn't a star but has plenty of time to develop his career and will be a decent squad option.

MOUSSA DEMBELE
Loan

Lyon grade: C
Atletico Madrid grade: B+

On first glance, letting a player who has scored 44 goals over the past two seasons go out on loan doesn't seem smart. But something is clearly wrong with Dembele's form as his one goal in 16 games this season attests. Lyon could bank as much as €33.5m (plus €5m add-ons) if Atletico choose to sign him permanently and they have already lined up Islam Slimani to replace him, but they wouldn't have wanted to let him go.

Atletico offloaded Diego Costa to free up some space and they could hardly have got a better striking option on loan. Dembele has shown he can perform at the highest level and, at 24, has plenty of room to develop. A loan fee of €1.5m isn't much to pay and even the €33.5m option in the summer is less than it would have been a year ago. A good move for minimal risk.

Jan. 8

SEBASTIEN HALLER
€22.5m (£20m, $28m)

West Ham: D
Ajax: B+

Haller moved to the London Stadium in summer 2019 for a club-record £35m, but it looked an expensive move at the time and he hasn't hit the heights expected of him since. With 14 goals in 50 appearances in all competitions, Haller's move wasn't a colossal failure but the Hammers opted to cut their losses and take a £15m hit while someone was still interested in him.

Ajax don't usually spend this kind of cash and it's notable that the €22.5m is the most ever paid for a player coming into the Eredivisie. The 26-year-old played under current Ajax manager Erik ten Hag at Utrecht -- where he scored 51 goals in 98 games before moving to Frankfurt -- so he can definitely succeed. With injuries to Lassina Traore, Klaas-Jan Huntelaar and Brian Brobbey, Haller is a great option who will settle quickly.

Jan. 7

AMAD DIALLO
€21m (£19m, $25.5m)

Atalanta: B
Man United: B

With only a handful of games under his belt for the Italian side, the October announcement that Diallo would move to Man United came as quite a shock. Atalanta brought the 18-year-old through their youth ranks and clearly rated him highly, but an offer of €21m, with another €20m possible in add-ons, was too good to refuse. It's possible they could have held out for another few years to see how he develops, but nobody would begrudge them taking the money in the current climate.

United are taking a gamble but their transfer policy is geared toward young players and they landed one of the most exciting wingers around. It would be a surprise if Diallo went straight into the first team, but they did well to hold off competition for a player they have tracked for a year after he impressed in the UEFA Youth League. It's a lot of money, but at least half the outlay is based on performance.

- Karlsen: What does the scouting world make of Diallo?

JAN. 4

SEAD KOLASINAC
Loan

Arsenal: C
Schalke: B+

Schalke are a mess and need all the help they can get after a winless run of 13 games in the first half of the Bundesliga. Bringing back a former player is a good start, while handing him the captaincy despite the fact he's only on loan for the rest of the season is a clear sign something isn't right. He will want to impress and can certainly help them.

Arsenal are taking a bit of a gamble on the fitness of Kieran Tierney. The Scotland defender has been excellent this season, but one injury and the Gunners may have an issue without Kolasinac. Left-back options would then be Bukayo Saka, who is better used further up the pitch, and Ainsley Maitland-Niles, who is more comfortable on the right or in midfield. Kolasinac was clearly frustrated about his lack of playing time (and probably also with his friend Mesut Ozil being frozen out), but letting him go in a season with more injuries than most could prove costly.

JAN. 2

DOMINIK SZOBOSZLAI
€20m ($24m)

FC Salzburg: B
RB Leipzig: A

The relationship between the two Red Bull-owned clubs made negotiations here pretty simple, as it's a well-worn path for players. It's possible that Salzburg may have been able to get more money for the Hungary midfielder, but they will bank the cash and move on to developing their next young talent.

Szoboszlai had courted attention from some massive clubs, including Arsenal, Milan, Bayern and Real Madrid. So Leipzig did incredibly well to persuade the 20-year-old that he should continue his development in Germany. It's probably the perfect club for him, as the style of play is similar to that of Salzburg and the Bundesliga has a reputation for enhancing the skills of young players. Expect to hear a lot more about Szoboszlai in the coming years.

FILIP STEVANOVIC
€8m (£6m, $9.75m)

Partizan Belgrade: C+
Man City: B-

Partizan took the unusual step of announcing the deal with Manchester City in October without City actually confirming anything, so there remains an element of doubt over this one. The 18-year-old winger is clearly highly rated by the Serbian club he joined as a 9-year-old, as he made the breakthrough into the first XI this year after moving through the youth teams. Partizan will bank the €8m plus add-ons but may regret letting Stevanovic go so early in his career.

City's scouts have seen something in the teenager, though it's likely Stevanovic heads out on loan (potentially back to Partizan) for the rest of the season. While he cites Cristiano Ronaldo as his role model for style of play, he's still far too inexperienced to make a dent in City's first-team squad. They did well to beat off a reported 15 clubs -- including Manchester United, Real Madrid, Liverpool, Bayern Munich and Chelsea -- for his signature, but he's clearly one for the future.