The Red Devils skimmed past West Brom on Saturday thanks to a penalty from Bruno Fernandes.
Greenwood, 19, missed the clash due to illness, and Solskjaer is excited is excited to get him back.
"We're looking forward to having Mason back fit again and well, so hopefully we can hit some form like we did toward the end of last season," said Solskjaer.
"We need to improve. We need to get more flow and rhythm to our game, be more clinical and take our chances.
"We've got plenty of quality and sometimes the most difficult thing is to keep it simple and sometimes we want to over-complicate things. Yeah, we want players to seize opportunity but we need more flow, rhythm, make the opposition move."