The midfielder is being linked with a move away in 2021.
But Kanchelskis told AmericanGambler.com: “For me he's a great player, and I think the problem for him is that he is not playing every game at the same level, like a Dennis Irwin. He needs to maintain the same level. He plays excellent football one game and then has a terrible game the next.
“It's a problem for the chairman because we need to keep hold of these players, and our players need to be comfortable and spend time playing with each other. We played four seasons from 1991 to 1994 together and we won two titles, because we played every game with the same team and played to a consistent level."