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Radamel Falcao’s agent insists the Colombian misfit can still be a success at Manchester United.

The former Porto, Atletico Madrid and Monaco striker is running out of time to convince Louis van Gaal to turn his loan move into a permanent one.

United will have to spend £43m at the end of the season to keep the 28-year-old at Old Trafford.

But after scoring just four goals in 16 appearances - and having his season disrupted by injury, Falcao will need to turn his form around if he is to secure a long-term deal.

He helped his cause by scoring against Leicester last weekend - and his agent Jorge Mendes is convinced he can still be a hit for Van Gaal.

“Falcao is a Manchester United player,” said Mendes. “Falcao will ­become Falcao again.

“He’ll be a great player with United. The problem is that in football you have a short memory.

“When a player is injured, after six or seven months without competing, people forget, but in the end the player is the same.

“Falcao is a top player who will leave his mark on United’s ­season. He will help them a lot and they’ll be very much better with him.”

There remain doubts as to whether Falcao has fully recovered from the knee-ligament damage that ruled him out of last year’s World Cup.

He has only shown glimpses of the quality that once earned him a reputation for being one of the most feared strikers in world football.