Manchester City defender John Stones told his team it needed to respect Celtic's quality ahead of its Champions League clash.
Pep Guardiola's side is flying high in the Premier League ahead of the meeting in Glasgow on Wednesday.
City is expected to continue its fine form, particularly against a Celtic side which opened its Group C campaign with a 7-0 loss to Barcelona.
Stones, however, warned City it needed to perform against Brendan Rodgers' outfit.
"You have to show respect to the opposition. They've obviously got quality, that's why they're in the Champions League," he said.
"The teams that are in it, deserve to be in it and we've worked hard to get in it. It's one that we'll be fully up for and I'm sure they will be as well. It's going to be exciting for everyone."
City is on a 10-match winning run to start the season, and it sits four points clear atop the Premier League.
Midfielder Fernandinho is wary of a response from Celtic to its heavy loss at Camp Nou. "I don't agree with us being favourites. It's going to be a difficult game," the Brazilian said.
"Of course, they had a painful defeat for themselves and the fans, but maybe that's one of the reasons they will step onto the pitch with a lot more concentration, motivated to try to win this home game.
"So we'll have to be very careful and stay very focused to not allow that to happen."