Ole Gunnar Solskjaer has joked that he can tell in training whether Mason Greenwood got an early night or if he stayed up late playing on his PlayStation.
The teenager scored Manchester United's equaliser as they battled back from one down to earn a point against West Ham.
Greenwood's 17th goal of the season means he has now become just the fourth teenager in the club's history to hit the tally.
Ole Gunnar Solskjaer has been hugely vocal in his admiration for the 18-year-old's finishing ability.
The Norwegian has made a concsious effort to give academy talent a chance and handed Greenwood his debut last term.
But the 47-year-old has joked that he can often tell whether the teenager has stayed up all hours on his games console.
He said: "Mason... you know when he’s had a good sleep and when he’s stayed up late playing PlayStation because he might not hit the ball as cleanly in training!
"But what he does today, he does that time and time and time again and when we do finishing you seen an exceptional finisher there and are not surprised when it hits the back of the net.
"I've probably run out of superlatives for him because he's that good a finisher. He’s bailed us out a few times and he’s done it again and he's been absolutely top class ever since we gave him an opportunity against Cardiff in the last game of last season - and he was our best player in that game.
"He's just grown and grown in confidence and belief and he trusts himself that his talents, qualities and attributes, actually work at the highest level.
"You expect him to hit the target The chance in the first-half when [Angelo] Ogbonna blocked it, that's also a very good strike, a fantastic hit of the ball. The kid's going from strength to strength."
