Zidane has been heavily linked with the role at Old Trafford, with Mourinho's position far from secure following United's poor start to the 2018-19 campaign.
"He was tired on a nervous level," Migliaccio told Journal du Dimanche. "He's decided to take a year out and he won't go back on that. I don't think he's going to England, it's not his style.
"I've talked to him and the truth is that it doesn't appeal to him."
United recovered from two goals behind to beat Newcastle United 3-2 in the Premier League on Saturday afternoon.