Arsenal boss Mikel Arteta is wary of facing Manchester United on Sunday.
The two teams are arguably the best performers currently in the Premier League.
On United manager Erik ten Hag, Arteta said, "Really impressive. I think he's turned things around pretty quickly. He has implemented a very clear way of playing. I think the players seem like they've bought into it, they have really good energy around the place. And a lot of things have changed in a very short period of time so credit to him and and the coaching staff for what they've done."
On United midfielder Casemiro's absence due to suspension, he said: "Again, it's something that we can't control. He didn't play in our first game either and we still didn't do enough to win that match. When you look at the squad that they have, it's just incredible.
"The individuals and the collective organisation can beat any opponent in this league and we'll plan the game knowing that [Casemiro] is not available, that's for sure."