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 Keown 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 .
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 .