Mata was among the players who came on for the second half but he was forced off shortly before the hour mark. Darmian picked up a knock in the 89th minute of the game, limping off and walking straight down the tunnel.
At the post-match press conference, Mourinho said: “Mata has a big ankle but I hope it is nothing important. A few days, a week, probably. Darmian's problem is not an important one."
Romelu Lukaku scored his first goal for the club in the 2-1 win.