Manchester United striker Radamel Falcao says he's close to reaching peak fitness.

Falcao hopes he will soon reach peak fitness and start repaying the club for the money they have invested in him.

"I'm almost at 100 per cent now, let's see wait and see what the decision of the coach is, when he wants to use me more," said Falcao, who is one of the top earners at the club.

Robin van Persie has scored four goals in his last four games and Wayne Rooney is starting to show good form while Van Gaal has shown a lot of faith in 19-year-old forward James Wilson.

Falcao acknowledges he faces tough competition to earn a regular starting berth.

"We have a group of strikers who are very good and that's good for everyone," he said.

"That means there is always a level of competition between us, healthy competition, and obviously I am very happy with how the team is doing."