By Josh O’Brien Arsene Wenger has claimed Bayern Munich “won’t be 100 per cent confident” when they welcome his former side Arsenal to the Allianz Arena on Wednesday. The Gunners drew 2-2 with the German giants at the Emirates last week in a game that saw the lead change hands, leaving the tie finely poised for the return leg in Munich. Since they last met in north London, both teams have suffered blows on the domestic front. Bayern finally saw their reign of dominance over the Bundesliga end, with Bayer Leverkusen being crowned champions. It marked the first time anyone other than Bayern had …