Ole Gunnar Solskjaer believes Marcus Rashford has always been improving and jokes about his knee injury, saying players are allowed of slide celebration as "it might be the last one you score".
Rashford suffered a knee injury after the superb display against Chelsea in EFL Cup. Talk of a Rashford rest has significantly subsided.
"He doesn't want a rest!" Solskjaer smiled. "I've been able to rest him a couple of times in Europe but he's such a fit boy, a professional boy. He looks after himself.
"Hopefully he had loads of sweets last night on his birthday so the energy levels are up. But when you get goals, when you score goals, when you get performances, you just want to play games. The rhythm of playing, resting, recovering and playing again, sometimes that's just as good."
Rashford has seven club goals so far this term and is halfway to beating his season-best tally of 13 in 2017-18 and 2018-19.
"He has probably never been on penalties as much as he is now," Solskjaer laughed at the fact Rashford has converted three spotkicks and missed two. "He knows he can get loads of goals, but he needs to add the scruffy ones, the tap-in ones like he did against Liverpool from two yards; a great run, great movement.
"He is improving all the time and he didn't really see those opportunities a year ago, and I think he is now quicker at reacting and smelling a goal. It's worth a 40-yard sprint.
"So, for me, I don't think he should set himself a target [of] 20 goals or 25, I think you should set yourself a target next game next goal."
Rashford suffered a knee injury in the League Cup win at Chelsea on Wednesday and some suspected he sustained it in his knee slide celebration. Solskjaer still has to correct punters convinced his chronic knee injury stemmed from his 1999 Champions League final celebration.
"That was not the knee I had to retire through," Solskjaer stressed. "It was different. I sprained my medial ligament so I missed a couple of games for Norway. It was the last game. I missed a couple of games."
So are knee slides banned? "No, they can do whatever they want when they score goals because it might be the last one you score."