Arsenal boss Mikel Arteta says they must be at their best if they're to match Manchester City this weekend.
Arsenal beat City in last season's FA Cup semi-finals and, given their impressive start to the season, Arteta was asked if the Gunners are at the same level as his former club.
"Our ambition is to go there and try to beat them again," he said. "We know the challenge, we know how hard it is. Every detail, every individual performance has to be top.
"We have to control a lot of aspects of the game against them that might be very different to the ones we had to control against Sheffield [United].
"We have to be able to adapt as a team when we face this kind of opposition."
Arteta left the assistant manager's job at Manchester City to take charge at Arsenal last December and his old club have only won one of their three league games so far this season.
"They still produce incredible numbers in everything they do," he said. "In my opinion, they've been really unlucky with some of the results they've got.
"They should have put games to bed very early. The level of efficiency of the opponents when they had chances or half chances have punished them a lot.
"I haven't seen many decreases in the level of their playing or what they are producing game by game. I haven't seen any of that."
