Bayern München captain Philipp Lahm admitted he was shocked to see the result of the match between Dinamo Zagreb and Arsenal on Matchday one of the Champions League.
The Croatian champions beat the English team 2-1 in Zagreb and now go to the Allianz Arena to face Bayern on Tuesday in a good frame of mind.
Lahm, who skippered Germany to the World Cup title last year, says he and his team will not take Dinamo lightly after their performance against the Gunners.
"The defeat of Arsenal in Zagreb really surprised me," Lahm told Goal. "At first I thought it was a mistake! Dinamo are very comfortable at home. They have a good group of fans, they're difficult to defeat.
"Dinamo will play extremely defensively, the defensive wall will be stronger than when you play a typical game. Dinamo will try to play on the counterattack."
The Bundesliga outfit will be looking for their second victory in Europe's elite competition after they beat Olympiacos 3-0 in Greece two weeks ago.