Champions League draw repeated after UEFA's Man United error

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How did UEFA botch the UCL draw? (1:24)

Gab and Juls explain why the draw for the UEFA Champions League round of 16 has to be redrawn. (1:24)

UEFA suffered embarrassment on Monday when the Champions League round-of-16 draw had to be repeated after the initial draw was rendered invalid due to a clerical error where Manchester United were mistakenly omitted as potential opponents for Atletico Madrid.

During Monday's initial draw, United were eventually paired with Paris Saint-Germain, having earlier been placed as opponents for Villarreal, whom they could not have met, having been in the same group as Unai Emery's side.

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"Following a technical problem with the software of an external service provider that instructs the officials as to which teams are eligible to play each other, a material error occurred in the draw for the UEFA Champions League round of 16. As a result of this, the draw has been declared void and will be entirely redone at 3 p.m. CET (9 a.m. ET/ 2 p.m. GMT)," a UEFA spokesperson said.

Atletico were the next team drawn and, while United should have been one of their potential opponents, they were omitted as a computer glitch appeared to indicate they had already been drawn when they had not.

"We are speaking to UEFA to check for an explanation and resolution after the errors committed during the Champions League round-of-16 draw," an Atletico statement read.

The draw was repeated later on Monday and the standout ties included Atletico Madrid v Manchester United and PSG v Real Madrid.

Round-of-16 draw

FC Salzburg vs. Bayern Munich
Sporting CP vs. Manchester City
Benfica vs. Ajax
Chelsea vs. Lille
Atletico Madrid vs. Manchester United
Villarreal vs. Juventus
Inter Milan vs. Liverpool
Paris Saint-Germain vs. Real Madrid

Initial round-of-16 draw, declared void

Benfica vs. Real Madrid
Villarreal vs. Manchester City
Atletico Madrid vs. Bayern Munich
FC Salzburg vs. Liverpool
Inter Milan vs. Ajax
Sporting CP vs. Juventus
Chelsea vs. Lille
Paris Saint-Germain vs. Manchester United