The midfielder is no stranger to sitting out matches after picking up a knock and once again he’ll be unavailable to help his team mates pick up points.
The 22 year old collided with United’s Paddy McNair ultimately having to be subbed off with a possible ankle ligament problem.
Scans after the match showed no serious damage but the player will still need time to recover and is almost certain to miss Arsenal’s midweek Champions League game against Borussia Dortmund.