London: Arsenal defender Per Mertesacker believes Bayern Munich are "untouchable" but is still hoping the Gunners can spring an upset when they meet in the Champions League tonight.


Per Mertesacker 

The European champions have suffered just two competitive defeats since losing 0-2 in the Last 16 against Arsene Wenger's men last March, with Borussia Dortmund overcoming them in the German Supercup and Manchester City beating them at home in the group stages of this season's competition.