Mainoo (undisclosed) will be assessed ahead of Sunday's Premier League clash against Leeds United, according to coach Michael Carrick.
Analysis:Mainoo picked up an undisclosed injury during Saturday's 1-1 draw against Tottenham, despite completing the full 90 minutes, and subsequently missed Monday's training session before being ruled out against Atletico Madrid. The midfielder has yet to receive clearance for the upcoming clash against Leeds, with Manchester United planning to evaluate his condition before making a final decision on his availability. His potential absence would further complicate the team's midfield rotation, especially with Manuel Ugarte (knee) also sidelined. Carlos Baleba, who made his debut against Tottenham, could be handed additional playing time if Mainoo is unable to recover in time.