Football - Arsenal v West Ham United - Barclays Premier League - Emirates Stadium - 9/8/15 Arsenal manager Arsene Wenger looks dejected as assistant manager Steve Bould looks on Reuters / Eddie Keogh

Arsenal manager Arsene Wenger has demanded a swift, sharp response from his side in their next two Premier League matches.

The Gunners slumped 2-0 at home to West Ham in their opening match and Wenger knows his side will have to improve against Crystal Palace and Liverpool - both of whom won at the weekend.

Wenger said: "A successful season is how you respond to disappointments and it is never a clear motorway. We have to respond quickly.

View photos Cheikhou Kouyate scores the first goal for West Ham More

"We have a tricky start. Crystal Palace are a very good team, Liverpool are a very good team, and you could see again that we are not completely there physically."

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New Arsenal keeper Petr Cech, whose error gifted West Ham's opener to Cheikhou Kouyate, posted a message on Twitter following the match to express his disappointment at the result which was "not in the script" and apologised for his mistake.

View photos Reality Cech: The Gunners keeper had a howler More

Wenger, though, refused to lay the blame on any one player.

"I can't see many individual convincing performances, so it is difficult to single someone out," he said.

"We were a bit nervous and we rushed our game a bit. We didn't always respect the basics."

Arsenal defender Per Mertesacker rued his side's "massive loss" and added: "Overall, we weren't decisive enough, especially in the final third. It looked like the last ball was always the wrong decision."

Arsenal failed to win four of their opening six games last season and the 30-year-old centre-back believes they cannot afford another upset in their next game at Selhurst Park.

View photos Per Mertesacker is confident Arsenal will bounce back More

"Sometimes it's good to come back from a massive loss. I think we are capable of coming back," he said.

"It's very important. We want to have a better start than last season so we need to be very cautious of the situation.

"To start with a game like that is not good but to bounce back is even more important now."