Solskjaer admits it's been difficult keeping Greenwood out of his starting XI.
He said, "Every game is difficult because I've got players that I feel deserve game-time but that's the privilege I've got because I've got many good players. But it's also the downside for some of the players that are going to take a sidestep and wait for an opportunity.
"I think Mason's attitude lately shows what a person he is and player he is. He's never sulked when I've asked him to start of the bench. He's come on – against Roma and Tottenham - and scored in both games and showed great attitude for the team."
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