Luton Town midfielder Ross Barkley tried to be upbeat after their 4-3 defeat at home to Arsenal.
Declan Rice found the winner for Arsenal seven minutes into injury time on Tuesday night.
Barkley said: "We've scored three goals against a top side. We need the same mentality against Man City.
"We know how good they are, they are the Champions of Europe."
Scoring three goals against the Gunners, he added: "It shows that we're growing and we can scores goals against anyone in the league. We'll talk about it tomorrow, put it behind us and move on to Man City on Sunday."