Arsenal boss Arsene Wenger felt Per Mertesacker was back to his best last night.

Mertesacker was impressive for Arsenal's victory over Champions League opponents Borussia Dortmund last night.

"I thought he had a great game tonight. I tried to analyse his performance against Norwich and I felt he was more tired from the Germany game against Holland. He didn't make bad decisions but his reaction time was not right. It was more down to fatigue," Wenger told arsenal.com.