Manchester United legend Roy Keane recently played a podcast program Stick to Football and expressed concerns about Manchester United's introduction of Baleba.
Keane said: "I would be surprised if the deal came true. Because I think that young man still needs to prove himself."
"Although the transfer fee is as high as £100 million, most of these players are still in the potential stage. You can't make such a sky-high price for players with uncertain futures."