Arsenal manager Mikel Arteta has admitted that Emile Smith Rowe is a slight doubt for Monday's Premier League battle with Everton.
Smith Rowe's substitution was initially thought to have been a tactical decision, but Arteta has now revealed that the England international will need to be assessed due to "discomfort".
Speaking to reporters at his pre-game press conference, Arteta said: "He had some discomfort during the game and we decided to take him off. He's been evolving well over the last few days, so we have to wait until tomorrow to see how he is."
Smith Rowe's strike at Old Trafford was his fifth goal of the Premier League season, four of which have come in his last six top-flight matches.