The Colombian picked up an injury in training last week, which ruled him out of yesterday's 1-1 draw with Chelsea at Old Trafford.
However, Van Gaal has suggested that the Monaco loanee should be available for selection in the near future.
"Falcao took a kick in training on Thursday and couldn't play because of that. We'll have to wait and see, but I don't think the injury is too bad," Van Gaal told MUTV.
Falcao has scored one goal during his five outings for the Red Devils this term.