Chelsea boss Mauricio Pochettino wants Raheem Sterling and Cole Palmer to celebrate if they score at Manchester City today.
The pair expected to start against the former club.
"If they celebrate, it's football," Pochettino said on Friday. "If they don't celebrate and want to show respect, OK, but I think when you score a goal you need to celebrate.
"You kill your former club and after you say 'sorry'. When you play for different shirts and badges and clubs, you cannot stop your feelings. When you score, it's the most beautiful feeling in your body and you cannot go, 'Argh, no, I don't want to celebrate'. You need to. You are now playing for another team.
"You showed respect when you were there and you gave everything to the club and the badge and the people. But now you defend another shirt, you need to celebrate because you are part of another history."
On Sterling, he said: "He is always positive, always helping, and that's very important. It's important to have a player like that in the project.
"It should be special to score at the Etihad but always it's special. I don't believe he needs to prove anything. Like Cole, they are both grateful for the period they were there and they talk very highly about the coaching staff, Pep (Guardiola) and the club, the organisation."