Arsenal beat Everton 2-0 in the Premier League on Sunday afternoon . Per Mertesacker was a headline omission from Arsenal 's starting line-up . The German international has been out since suffering an ankle injury against Southampton last week and is expected to be sidelined for at least six weeks, with Wenger admitting he will not rush him back into action until Gunners boss Arsene Wenger said the German has been rested . Sportsmail 's Martin Keown believes it could be a defining moment in changing Arsenal 's back four .
Arsenal beat Everton 2-0 in the Premier League on Sunday afternoon . Per Mertesacker was a headline omission from Arsenal 's starting line-up . The 30-year-old struggled during Wednesday 's 3-1 defeat at the hands of Monaco in the Champions League . Gunners boss Arsene Wenger said the German has been rested . Sportsmail 's Martin Keown believes it could be a defining moment in changing Arsenal 's back four .