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Christian Pulisic has featured just once for Chelsea in our last five games.
Chelsea boss Frank Lampard left Pulisic and England international Ross Barkley out of his 18-man squad for the midweek Champions League victory in Lille.
The media in the USA have accused Lampard of favouritism as they believe he is picking young English players ahead of Pulisic.
Lampard has now revealed what Pulisic must do to get back into the team.
Lampard said: “This is one of my difficult problems in this job, that I have good players and everyone has a story.
“Christian Pulisic has a price-tag, Ross Barkley is an international player, Mason Mount is an international player.
“Callum Hudson-Odoi has just signed a new contract, Bayern Munich wanted to buy him last summer, he is an international player.
“Ruben Loftus-Cheek will come back and be an international player — and I can’t pick them all in the game, unfortunately.
“All I have to demand of them is that they show me in training or show me in the game when they get the chances to play that they are worthy of their place.
“That’s not to make me sound like a hard taskmaster, that’s just a brutal reality of my job. Next week I might be asked about two other names.”
Lampard added: “I spoke to him two days before the Grimsby game and was very clear about the standards.
“And we have to give him the fact he has moved country, moved leagues and is as young as all the young players we keep talking about. He has just turned 21.
“What he needs to do is work daily and work to show within the group that he deserves to play.”