French midfielder Pogba, 19, was considered one of the outstanding talents to emerge from the club's Academy in recent years but his future was consistently questioned last year as he rejected offers of a new deal at Old Trafford.
Now Ferguson has announced the formal end of his time at United, telling MUTV: "Pogba signed for Juventus a long time ago as far as we're aware.
"It's a bit disappointing because I don’t think he showed us any respect at all.
"To be honest, if they carry on that way, I'm quite happy that he's away from me anyway."
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