Mikel Arteta was not happy with our performance against Olympiacos on Thursday night - and says we will to improve to beat West Ham.
We travel to the London Stadium this weekend to face David Moyes' in-form side, and our manager is looking to see us learn from the lessons of our Europa League defeat.
"Basically we have to maintain the standards that we set, particularly when we are in possession of the ball," Arteta said. "We had too many situations [against Olympiacos] where we didn't discriminate or make the right decision and then execution-wise we weren't at our best.
"We know we will have a really tough game [on Sunday], they've been in great form, they've been really consistent, they know really well what to do and how to hurt opponents.
"I know David really well and I am sure he will prepare the match so it is a really difficult game for us."
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