Germany kick off their title defence on Sunday with their Group F opener against Mexico.
VfB Stuttgart continued their unbeaten run under new coach Thomas Schneider on Friday, climbing to sixth with a 1-1 home draw against Nuremberg who are still looking for their first Bundesliga win of the season.
Germany must come out firing from the first minute when they meet Northern Ireland on Tuesday or they could risk giving the underdogs the confidence to spring a surprise in their final Euro 2016 group game, centre back Mats Hummels said.
Thiago Alcantara's sensational flying volley in stoppage-time earned Bayern Munich a 2-1 win at VfB Stuttgart on Wednesday, extending their unbeaten run to 43 league games and increasing their Bundesliga lead to 13 points.
Striker Robert Lewandowski scored a second-half hat-trick as Borussia Dortmund reclaimed top spot in the Bundesliga with an awe-inspiring 6-1 demolition of VfB Stuttgart on Friday.
Germany's defence will be put to the test in their opening Euro 2016 group match against Ukraine in Lille on Sunday with major questions still to be answered about the world champions' new-look rearguard.