Per Mertesacker accepts Arsenal were “not switched on” during the derby defeat to Tottenham on Saturday.
Per Mertesacker believes Arsenal can challenge for honours again this season after signing Gabriel Paulista.
Arsene Wenger has backed under-fire Arsenal centre-backs Per Mertesacker and Calum Chambers after recent criticism.
Jamie Carragher believes Per Mertesacker "abandoned" Arsenal's youngsters in the 3-2 defeat at Stoke on Saturday.
Per Mertesacker has admitted he has struggled with motivation since winning the World Cup with Germany this summer.
Arsenal defender Per Mertesacker is confident that the team can fight their way back into the Premier League title race.
Per Mertesacker has warned Chelsea that Arsenal are ready to "try new things" when they head to Stamford Bridge.
Arsenal boss Arsene Wenger has confirmed that he has recalled Per Mertesacker earlier than he wanted to.
Arsenal defender Per Mertesacker has announced his retirement from international football
Arsene Wenger has revealed that Arsenal's three World Cup winning players will miss the start of the new season.
Lukas Podolski is hoping that Arsenal's German contingent can build on their FA Cup glory at the World Cup this summer.
Per Mertesacker is determined to give Arsenal fans a trophy to celebrate this weekend, with victory in the FA Cup final.
Arsenal's Per Mertesacker does not believe defeat against Hull City in next week's FA Cup final would be a disaster.
Arsenal trio Per Mertesacker, Lukas Podolski and Mesut Ozil have been named in Germany's provisional World Cup squad.
Per Mertesacker insists Arsenal have answered their critics as they close on Champions League qualification once again.
Mesut Ozil must strive for greater consistency to succeed at Arsenal, according to team-mate Per Mertesacker.
Per Mertesacker believes the return of some leading players from injury will give Arsenal impetus to secure fourth.
Arsenal boss Arsene Wenger has cancelled his press conference ahead of Tuesday's game with Swansea.
Arsenal defender Per Mertesacker says the rest of March will be pivotal in their hopes of success in the Premier League.
Arsenal duo Per Mertesacker and Tomas Rosicky have both signed new contracts at Emirates Stadium
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