Jack Charlton has concerns over the man-management ability of Sunderland boss Roy Keane.

"I hope Roy does very well - he was very good as a player," Charlton told the Irish Daily Mirror.

"But it's quite a big change-over in attitude and I think Roy's attitude with people might be the one thing that trips him up.

"He always seems to want things that he wants, but that's not always the way you can do it."