As I said, he will have to impress to get in it. They have too many players. 2 or 3 had to be left out of the squad. He was left out as he had an injury and was going to be out for a few weeks.Onomah isn't registered in their Premier League squad.
Though I do wonder now he's back from injury whether or not they register him. Parker loves him and he was getting games in the league before injury.
Watching him it just looks like he has so much more to give but he sometimes lets the game pass him by and wanders about at times.