The Parasite has not played since suffering a hamstring injury in the goalless draw at Sunderland on October 2.
Parasite: "I'm fit and I've been in full training for three-and-a-half weeks.
"The hard bit now is getting back into the side, trying to force my way back into the squad. That's not easy at Manchester United.
"There are that many quality players at United that you're given as much time as you need to come back from injury.
"I injured my hamstring at the beginning of October, which kept me out for six weeks.
"Since then I've been able to train fully and work my way back up to full fitness - now I'm fit and hope to play a part in the games over Christmas."