Borussia Dortmund coach Jurgen Klopp was disappointed with his side's performance against Hamburg in the Bundesliga on Saturday.
The defending German champions went down 3-2 at the Imtech Arena, thanks to a double from Son Heung-Min and an Ivo Ilicevic strike.
"Not much pleased me today," said Klopp after the match.
"The problem was with the way we came into the game. The opening exchanges were really poor."
The defeat leaves Dortmund in fourth place in the league table with seven points from four matches.
