Arsenal boss Arsene Wenger says defender Per Mertesacker will get better.

The former Werder Bremen captain is still adjusting to the pace of the Premier League.

Wenger told "I believe Mertesacker had to adjust to the pace and commitment of the English game but I feel that in every game he gets stronger. Let's not forget that we missed Koscielny as well. I personally feel that the defensive frailties we had recently were more down to other departments in the team than the defenders."