German Supercup: Pep Guardiola defeated in Bayern Munich debut

 Bayern, who beat Dortmund at Wembley in May to win the Champions League, lost out as Marco Reus scored twice for Dortmund at the Westfalenstadion.

Arjen Robben - who scored the winner at Wembley - hit both of Bayern's goals.

"Even though we lost, I didn't get the feeling that Dortmund were better than us," Guardiola said.  "We still have 10 days to get ready for the Bundesliga restart and to correct our minor errors."

Guardiola, who won 13 trophies in four years before leaving Barcelona last year, has the ominous task of replacing Jupp Heynckes at the Allianz Arena.

Under Heynckes, Bayern became the first German team to win the Bundesliga, the European Cup and the German Cup in the same season last year.