However, Rashford's struggle for his best form and his general demeanor have left fans questioning whether he is in the right frame of mind at United.
Speaking after Sunday's 2-2 draw with Liverpool, Rooney told Premier League productions: "He has had a very difficult season. We all know he has got the ability and got all the attributes to be a top world-class player. That's the frustrating thing.
Last season, he went and scored a lot of goals. But this season, he hasn't kicked on.
He doesn't look happy when he is playing. You wonder, is his best option to move away from the club and have a fresh start?
But he is a Manchester lad. I would love to see him get his career back on track at the club, go on to score goals and try to help the club win trophies. But he certainly has had a difficult season."