Juventus’s Paul Pogba claims he was made to train alone during the contract dispute that preceded his move to Turin.
The 21-year-old French midfielder left United in July 2012 after failing to agree a contract extension.
“They left me out because they said I wanted to leave. That is disrespect,” Pogba told BBC World Football Focus.
“Maybe they didn’t think if they were making a mistake.”
Pogba himself was accused of a lack of respect when he left United, with then-manager Sir Alex Ferguson telling MUTV he was “quite happy” to see the player leave.
“I don’t think he showed us any respect at all,” Ferguson added.
Pogba made just seven substitute appearances for United and insists his move was motivated by a desire for more playing time rather than money.
“Manchester United is a big club but you have to think about yourself,” Pogba added.
“You have to play. The coach told me there would be space to play, but I wasn’t playing.
“I was training alone for one week. They told me to go in the gym. I said ‘I am not an athlete, I am a footballer.'”
Juventus won Serie A in Pogba’s first season with the club and are on the brink of successfully defending the title.
Pogba has been a key part of their success, scoring 12 goals in 60 league appearances.
His good form has prompted talk of a move back to Manchester, with both United and City rumoured destinations, as well as a £40m switch to French champions Paris St-Germain.
Juventus president Andrea Agnelli said in October that his club would find a big-money offer for Pogba hard to resist.
Written by Steve Milne