The Belgian midfielder came off the bench in midweek during the Champions League tie with CSKA Moscow and has been regularly used by van Gaal as a ‘plan B’ when things aren’t quite working out for Man United in attack.
However, without that option, he’ll now have to focus elsewhere and avoid using Fellaini’s power to launch a different style of play going forward.
There is no confirmation on how serious Fellaini’s injury is but with a two week international break now just around the corner, he may well be fit in time for the first game back away to Watford.
Louis van Gaal confirms Marouane @Fellaini misses out after picking up a late injury: "I had hoped he'd recover but it was not like that."
— Manchester United (@ManUtd) November 7, 2015
Fellaini has had his doubters, myself included, for some time but if used correctly and at the right time, he can actually be quite useful.
That being said, there is every chance van Gaal would be forced to use more ball-playing individuals instead which could, in turn, give United a bit more dynamism in attack which wouldn’t be the worst thing in the world.