Roy Keane says Marcus Rashford must be "ashamed" of his continued exile at Manchester United.

The England forward has not played for the Red Devils since the 2-1 Europa League win at Viktoria Plzen on December 12.

United boss Ruben Amorim stated after the 1-0 win at Fulham on Sunday that he would sooner select 63-year-old goalkeeper coach Jorge Vital than Rashford right now as his professionalism was once against questioned.

Speaking on the Stick to Football podcast, ex-United captain and Red Devils legend Keane expressed his disbelief at the situation.

"I can't get involved in the conversation. I still can't understand at any level - whatever's going on with players leaving, months left on contracts - a player who doesn't train properly," Keane said.

"I don't understand it; you might as well leave me out of this conversation. Especially if you think he wants to move, which is more of a reason to train properly so when you go to a new club you're up to speed and when you leave the club at least you showed a decent attitude. He must be ashamed."

Fellow Red Devils legend Wayne Rooney also revealed that Rashford has been training alone at their Carrington training base.

Rooney said: "I went into Carrington on Sunday to take my kids to game day and Marcus Rashford was out on the training pitch with the fitness coach.

"But he was right over towards where the parents were walking past for the kids' games. I looked at him thinking how embarrassing it must be for him as parents walk past."