Rashford looked to be struggling after being on the receiving end of a heavy challenge at Old Trafford during the second half.
He was substituted for Memphis Depay after 64 minutes played but van Gaal claimed that Rashford only suffered a knock:
Van Gaal happy with the performance. Only criticism was that it was a '5-0 game'. Says Rashford isn't injured but got a kick.
— Rob Dawson (@RobDawsonMEN) April 20, 2016
The news will come as a relief to supporters ahead of United’s FA Cup semi-final against Everton on Saturday.
Rashford has been in scintillating form recently, scoring seven goals since his debut for the club in February.
But it was his all-round game that was much improved against Palace. Rashford had a sound presence of mind and his movement and vision was superb. You get the sense that he will play a big part if United are to reach the Cup final.