By Arsenal correspondent Tony Hughes

Diego Costa admits his poor form at the start of the season was partly due to him returning from his summer break “overweight” and out of shape.

The Chelsea striker has scored only two goals for the club this season and admits he did not look after himself properly after their Premier League triumph in May.

“I’m going to be very honest,” said Costa. “Five or six weeks ago, I was not on top of my game, at least physically.

“I got injured at the end of the season and then I went on holiday. Maybe I got out of my diet and when I came back I was not the way I was supposed to be. I was a little bit overweight, and that affected my game.”

Costa has been photographed partying in Ibiza on a number of occasions and is known to make the most of his down time.

The Spain international, who has been training with Chelsea during the international break after not being selected for the national squad, claims the blame for the team’s catastrophic form should be laid at the door of the players and not manager Jose Mourinho.

Got the blues: Diego Costa admits he was 'overweight' at start of season

Got the blues: Diego Costa admits he was ‘overweight’ at start of season

Costa said: “You can be selfish and blame it on the manager but I’m not going to do that. I’m responsible and so are the other guys. We need to blame the players.

“We know we were not 100 per cent when we got here. We came back from holiday very confident, and thought we could go back into how it was last season. When we actually realised where we were, the team was already in a bad situation.”