Amrabat said he will play what ever position put him by Erik ten Hag, I don't think problem with nice performance on debut match with Manchester United and he will play as holding midfielder or Manchester United tactician can use him as defender to make solid defense area. For holding midfielder have many choose for Erik ten Hag but in defender still confused because some player not on the top level and still inconsistency performance.
In fact, Amrabat's arrival is quite helpful in strengthening Man United, especially if his will is in accordance with the strategy given by Ten Hag, then this should go well. Because sometimes, coaches and players don't get along just because of positioning. Meanwhile, Amrabat complied with Ten Hag's decision. This might be better. but still, this will not be a guarantee because sometimes Ten Hag is not that good when making decisions. However, again, everyone certainly hopes that Amrabat's presence can bring change, however, don't know.