Nacho Monreal has claimed that Arsenal's shock opening-day defeat to West Ham United has increased the need for a "perfect game" at Crystal Palace on Sunday.

The Gunners slumped to a surprise 2-0 defeat at the Emirates last week as the North Londoners' 2015-16 Premier League campaign started on a bum note.

In contrast, Palace enjoyed a 3-1 win at Norwich City, and Monreal warns that a flawless performance is needed at Selhurst Park.

"We have played many times against them away from home and we have won each time but we know they are a difficult team," the left-back told the club's official website.

"They have really good players who are physically hard. We know it will be a difficult game but after losing our first match, we must win.

"We have to play like we know how. If every player gives 100 per cent then I think we will have many options to win the game. Obviously we have to make a perfect game from the first minute to the last and if we do that, I think we will win."

Arsene Wenger's side did the double over their London rivals last season.