Greenwood will get chances but I think Gomes and Chong won’t get a look in ahead of Mata and even Sanchez when he returns.
If you assume Lingard, Rashford and Martial are our first choice front three, and assume three spots on the bench max to cover these positions, then you have James, Mata, Sanchez, Greenwood, Chong, Gomes and even Dalot all competing for these spots.
Also worried Axel won’t get much time ahead of Jones and Smalling.
Realistically Ole is going to have start leaving senior players off the bench, which I don’t thing he will.