Speaking to Football Insider, the 42-year-old, who spent eight seasons between the sticks for United, was asked to give his opinion on whether Roy Keane would be a good fit for the club.
He revealed: “That’s the problem with someone who was so good (as a player). Roy Keane, for example.
“I played a couple of times in Ireland squads with Roy. He’s straight down the line, no messing about. I got on with him. Everything had to be 100 per cent or you’d know about it. He’s got incredibly high standards.
“That’s the problem with him being a manager. Because he was so good, he expects players to be at his standard and they’re not. I’m not so sure he can deal with that.”
Kenny continued: “He’s had a bit of a managerial career, but it’s been 10 years since he was last employed.
“Is he up to it? Is he up to bringing a team that have just gone down straight back up? It would be tough because he’s been out of the game so long.”
Keane hasn't held a managerial role since leaving Ipswich Town back in 2011, but has subsequently had assistant roles with the Republic of Ireland national team, Aston Villa, and most recently Nottingham Forest.
The former Manchester United star, who won seven league titles at Old Trafford as a player, has also been linked with the vacant post at Celtic, where he spent the final year of his playing career.