When you are chasing a game at 0-0, usually a manager will make all three substitutions to try and win it.
Ole Gunnar Solskjaer only made two against Crystal Palace.
He had already brought on Scott McTominay and Dan James, and seemed to run out of options after that, with the bench decimated by injuries.
One player who fans were calling for was Amad Diallo.

The young winger is creative, unpredictable, tactically disciplined, and surely made for breaking down tough opponents like Palace.
Unfortunately Solskjaer did not agree, and Amad waits still for his Premier League debut.
Speaking after the match, Solskjaer said that he simply felt Mason Greenwood, Bruno Fernandes and Marcus Rashford had a better chance of breaking the deadlock.
Solskjaer decision did not work out, and his faith in the trio he mentioned was misguided.
The three players failed to register a shot on target between them all game.
Managers should be prepared to take risks, and Solskjaer is becoming too frightened to do so.
We saw this against Real Sociedad at home last week, against Chelsea at the weekend, and in numerous 0-0 draws against top teams this season.
Last night’s 0-0 draw felt like the worst of all of them. It wasn’t like United peppered Vicente Guaita’s goal with shots.
Amad will get his opportunity, and he’s no guarantee to knock it out the park like Federico Macheda once did not his league debut, or Marcus Rashford, but sooner or later you have to be prepared to give him a go, and let him try and help the team out, rather than waiting until a match is already won.
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