Paul Pogba's departure from Manchester United was among the biggest mistakes made byb Sir Alex Ferguson's during his 26 years as manager, according to former striker Louis Saha.
Pogba left Old Trafford under a cloud following a contract dispute having made just seven first team appearances during three years at the club.
The France international has since gone on to excel for his new club Juventus, with whom he has won two Serie A titles, and with France where at the 2014 World Cup he has helped his side reach the quarter-final.
The 22 year old has been among the stand out players in Brazil, and Saha believes those showings, which included the opening goal in the last 16 win over Nigeria, have exposed the decision to allow Pogba to leave.
"It's not often I will criticise Manchester United and Sir Alex Ferguson but it's clearly one of their biggest mistakes," he told talkSPORT.
"Because he's clearly a talent. He's a confident player and he's always trying to improve. He's got a lot of aggression but he's got so much potential to improve.
"He's been very important for France and showed in the last game [a 2-0 win over Nigeria] he can score goals and he can dictate the midfield area.
"He was very strong in his desire to go forward and he is a great box-to-box player. He reminds me of Patrick Vieria but with maybe a bit more style."
Both Pogba and agent Mino Raiola have since taken swipes at Ferguson at United over their treatment of the French international, who has regularly been compared for former Arsenal midfielder Patrick Vieira.
And the France World Cup winner said: "People say he's like me — I guess we have similar power in possession and he's strong, quite tall, an elegant player.
"But in his head he's more attacking than I ever was. I would win more balls but he's more technical. He'll become one of the best in the world."