Mikel Arteta has praised West Ham's clarity and consistency ahead of our clash against them on Wednesday night.
We could move into the top four with a victory at Emirates Stadium, but the boss says we will have to be at the top of our game to beat them.
"For me they are one of the best teams in the league," he said. "The understanding that they have, the clarity in what they want to do and how much they are able to hurt teams with the way they play has been impressive and they have been really really consistent.