Gervinho says Arsenal have to put Saturday's defeat behind them and focus on another big game against Olympiacos in the Champions League on Wednesday.

The Ivory Coast international scored his fourth goal of the season with a smart finish against Chelsea but ended up on the losing side as the Blues ended Arsenal's unbeaten start to the campaign.

It’s a big disappointment," said Gervinho. "These games against opponents for the title, we can’t afford to lose them, especially at home. They count a lot in a season.

"We had a great team against us, with great players, technical players. Chelsea managed to keep the ball well and caused us problems.

"It would have been great for us to win it but we had no luck and we were not as good as our last game. It’s a big disappointment. But we need to swallow this defeat and to focus again on Wednesday's game - because that is another big game."

Olivier Giroud missed a chance to snatch a point when he was played through by Alex Oxlade-Chamberlain on Saturday but the France striker believes the goals will eventually flow for him.

"It was a good pass from Alex and I think that I needed to go round the keeper as he came out quickly," said Giroud. "If I chipped the ball, the defender could have saved it. So I think I made the right call.

"I scored in midweek [against Coventry] and it was really good for me to score. And I will keep working hard to score goals."

Copyright 2014 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source 1 Oct 2012