Arsenal boss Arsene Wenger admits he needs to buy a new midfielder next month.

Wenger dropped the hint after defeat at Champions League opponents Olympiakos last night.

"If everybody is fit we have a strong squad but in certain areas, of course when you have players like Diaby and Rosicky not fit, we are a bit short because we cannot rotate. We'll see where we stand on January 1 and see what we do," said Wenger.