The Frenchman was signed by Louis van Gaal but the Dutchman's departure limited his opportunities in the first-team, playing just 14 league minutes under his successor Jose Mourinho before leaving for Everton.
"In terms of the commercial side, all the aspects off the pitch and on the pitch make it for me the biggest club in the world," he told Nice-Matin.
"It was a source of pride for me [to play there], an honour.
"I would have preferred my time there to be longer, that it took a different direction. But it is certainly my fault, I should have been more patient yet again.
"But I don't regret it at all, it was a fantastic experience."