Arsenal 0-0 Man Utd: Per Mertesacker says defensive form is back

Arsenal defender Per Mertesacker says that his side's defensive form is back after their 0-0 draw with Manchester United at the Emirates.

Olivier Giroud, Santi Cazorla, and Laurent Koscielny all missed chances as the Gunners missed the chance to return to the top of the league.

The Gunners were beaten 5-1 by Liverpool last Sunday and will face them again in the FA Cup this weekend.