Arsenal manager Arsene Wenger has warned his players that they need to be prepared for a battle with Chelsea's striker Diego Costa in Sunday's clash against the Blues.

The Spain international is expected to recover from his shin injury in time to feature against the Gunners at the Emirates Stadium and Wenger has urged his players to be prepared after he got under the skin in the reigning champions' 2-0 win at Stamford Bridge in September.

"We have to focus on our own performance and forget a little bit about Diego Costa," Wenger said.

"But we have to be prepared for a battle because Costa gives you a fight. After that, it's down to the referee."