Arsenal manager Arsene Wenger has confirmed that Mathieu Flamini is out of tomorrow's Champions League meeting with Borussia Dortmund at the Emirates.

The midfielder suffered a head injury during their win over Norwich but he will be available for their Premier league meeting next weekend against Crystal Palace.

The Frenchman has been in excellent form for the Gunners since returning on a free transfer. 

But he had to be substituted after a clash of heads with Alexander Tettey.

Theo Walcott is also out after suffering an injury setback.