Radamel Falcao's fitness for Manchester United's clash against Chelsea on Sunday is in doubt after the striker picked up a minor injury on Friday.
United boss Louis van Gaal said Falcao was hurt during training, but insisted the on-loan attacker is no longer dealing with a knee injury.
"He got a kick in the morning [on Friday] so we have to wait and see if he's fit enough," Van Gaal said, according to the team's official website. "But it's not a knee problem.
"He had a knee problem but not anymore. We have to build Falcao up, that I have also said in the first press conference when he came to our club."
Falcao was a substitute in last week's game against West Brom because he was suffering from jet lag after he spent the international break with Colombia.
Manchester United will also be without Wayne Rooney up top as he serves the final game of his three-match suspension.
If Falcao is unavailable to go against Chelsea, Van Gaal will be left with just three true forwards: Robin van Persie, Will Keane and James Wilson.
"It is difficult because we are playing [games] already, that's difficult but we have played him because I like the way he was playing so we play with two strikers," Van Gaal said. "Now I have to choose between two strikers, even three because Wilson can also play, the younger player."