If he can fit in and play a part under OGS it's a bonus as I think a lot of United fans had kind of given up on him, his contributions in the big games were minimal at best under Mourinho. He is going to be behind Rashford and Martial for a starting place, possibly Sanchez as well if he attains full fitness and starts playing to his best in the next few months.
It really is strange to think that Mourinho couldn't see past Lukaku and Martial and Rashford both largely struggled under him, his comments like "you ask Lukaku, Lukaku, why always Lukaku - you see why now", when he had given the other two a run out and basically suggested both were no use seem laughable now.