Marcus Rashford has scored just eight goals in 38 appearances for Manchester United so far this season - a far cry from last term when he scored a career-best 30 goals for United. The 26-year-old has also faced criticism over his off-field conduct.
"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," Wayne Rooney said in an interview.
"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," he continued.
Moreover, the 38-year-old hinted that the England winger could try his luck at another club to get back to his best. "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," he concluded.