Former Manchester United striker Dwight Yorke has singled out midfield duo Fred and Scott McTominay as needing to "stand up and earn their money" ahead of their busy run of fixtures.
Erik ten Hag is likely to have to call on both players following an injury to Christian Eriksen and suspension to Casemiro.
The former Real Madrid star must serve a three-match suspension for his antics during United's 2-1 win over Crystal Palace.
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Despite the addition of Marcel Sabitzer on transfer deadline day, both Fred and McTominay are expected to play an important role in the coming weeks.
Whilst McTominay is thought to be still recovering from a knock, Fred looks nailed on to start against Leeds on Wednesday evening.
Having acted as Eriksen's understudy for the bulk of the campaign, the Brazilian will be hoping to impress as he attempts to sneak back into the starting 11.
Yorke warns players to "earn their money"
The former Australian A-League manager has urged both players to step up to the plate, as United embark on a crucial run of fixtures which could define their season.
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"It's harsh on his [Casemiro's] team-mates because we all know what he brings to the table, and they're a much better side with him involved," the former Sunderland striker told Ladbrokes: Fanzone.
"It'll be a massive loss for them, but this is where the top teams are tested; you need players to come in and do the job while he's out.
"For the likes of Scott McTominay and Fred, their job right now is simple: they've got to stand up and earn their money. You've got to come in when the team needs you.
"Erik ten Hag needs to pull those players aside and just stress how much he needs them in Casemiro's absence. That's where you get team unity when the boys sitting on the bench can come in and do a job. Help the team.
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"These fringe players have to stand up… it's why you have such big squads. You can't rely on one player all season.
"There has to be depth in quality, otherwise what are you getting paid for? I hope the players recognise that and I hope Ten Hag can trust his players. This is their moment. He needs them now."
Topics: Manchester United, Scott Mctominay, Fred, Erik Ten Hag, Casemiro, Christian Eriksen, Leeds United, Premier League, Football