Borussia Dortmund 4-2 Bayern Munich: Pep Guardiola Slaps Thiago (VIDEO)

WATCH: Guardiola Slaps Thiago During Debut

Thiago Alcântara has been at Bayern Munich a matter of weeks but that did not spare him from feeling the wrath of Pep Guardiola, who slapped the former Barcelona midfielder as the European champions were battered by Borussia Dortmund in the German Supercup.

In a game which further illustrated Bayern's brittle defence, Guardiola became so irate with his failing players he dished out some physical punishment during the game.

Thiago started in an experimental Bayern XI which had no answer to Jürgen Klopp's Mario Götze-less Dortmund.

In what could be the beginning of another fascinating period in the Bundesliga, Klopp played his strongest possible side, with new signing Henrikh Mkhitaryan sidelined through injury.

İlkay Gündoğan played off of wantaway striker Robert Lewandowski and wreaked havoc, scoring a superb third either side of strikes from the ebullient Marco Reus.

Daniel van Buyten put through his own net as teammate Arjen Robben - who scored winners against Dortmund in last season's DFB-Pokal Cup and Champions League finals - struck twice at Signal Iduna Park.

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