Andrea Pirlo has accused Alex Ferguson of making a major mistake in allowing Paul Pogba to leave Manchester United in 2012.
The French midfielder quit Old Trafford for Juventus after growing frustrated with his lack of first team opportunities under the Scot.
He has since gone on to become one of the most highly-coveted players in Europe, and could add a Champions League winner's medal to his CV on Saturday when Juve face Barcelona in the final in Berlin.
Pogba recently said that his progress in Serie A has justified his decision to leave United, and that view has been endorsed by Pirlo.
The veteran Italy midfielder has seen Pogba's qualities at close quarters alongside him, and has told the Daily Mirror that he is baffled at Ferguson's decision to allow him to leave.
He said: "If Paul carries on the way he is, he will become the greatest midfield plater in Europe. At his age, 22, he could have that title for a long time.
"I don't understand why Manchester United let him go. If you look at their midfield now, they could really use a player like him.
"It might have been a personal issue for Alex Ferguson because it is clearly nothing to do with ability.
"Pogba has never really talked about the situation but whatever the reasons he left, it has been great news for Juventus."
Paul Pogba has insisted he was right to leave Manchester United for Juventus after saying that Saturday’s Champions League final against Barcelona justifies his decision to walk out on Sir Alex Ferguson.