Arsenal will undoubtedly take note of Bayern Munich coach Thomas Tuchel's post-match comments after he had no explanation for their collapse against promoted side Heidenheim.
Bayern was leading Saturday's Bundesliga game 2-0 at the break after goals from Harry Kane and Serge Gnabry, then conceded three in the second half to lose 3-2 for its second consecutive Bundesliga defeat.
Tuchel, whose team next visits Arsenal for the first leg of their Champions League quarterfinal on Tuesday, had no explanation.
'In the first 15 minutes of the second half, we gave away everything we had built up.