Pablo Piatti scored a late winner as LaLiga side Espanyol condemned Peter Bosz's Borussia Dortmund to a 1-0 loss on Friday.
Borussia Dortmund's underwhelming preparations for the new season continued with a 1-0 defeat against Espanyol on Friday.
Dortmund had the majority of the ball, but both teams struggled to create clear chances in a well-matched clash in Winterthur, with the Bundesliga side having only won two of their five pre-season friendlies under new coach Peter Bosz.
Pablo Piatti came up with the winning goal with 11 minutes to play, the substitute neatly lobbing Roman Burki after the Dortmund goalkeeper was caught well off his line.