The 18-year-old came on as a substitute against Everton on Sunday, to score an important equaliser in the 1-1 Old Trafford draw.
It was Greenwood's seventh senior goal of the season and made it three in four days, following his double against AZ Alkmaar in the Europa League.
Solskjaer was a born finisher himself and Mason's hit against Everton has been compared to the manager’s winning strike in 1999, when he scored late against Liverpool in a dramatic FA Cup tie at Old Trafford that effectively set the ball rolling for the Treble success.
“Mason is different class in and around the box.