Despite noting that Bruno Fernandes showed glimpses of quality, Ryan Giggs claimed that the midfielder could be a defensive "liability" in a deep midfield role.
Fernandes was a January signing from Portuguese outfit Sporting CP on a 55m euros (£47m) deal but add-ons could increase the overall cost to 80m euros (£67.7m).
Speaking as a guest on Premier League Productions, Giggs revealed how Fernandes could be a liability for United, "There was glimpses of the quality he does possess.
"I think it might need a bit of working out what his best position is. With his back to goal, I don’t think that’s his position. When he’s a little bit deeper, defensively, he may be a bit of a liability.
"He’s in between the two really. That’s where you want to see him, coming on to the ball [heading into the final third].
"But also you see when he is that little bit deeper he can spray the passes, he has got the vision to then play those passes. But then you need the runs."