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The Borussia Dortmund player was seen relieving himself against a pillar after a night of revelry following his side's 2-0 DFB-Pokal final loss to Bayern Munich

Kevin Grosskreutz has apologised following a drunken incident after Borussia Dortmund's defeat to Bayern Munich in the DFB-Pokal final.

Eye-witnesses reported seeing the 25-year-old urinating against a pillar inside the historic Hotel Berlin before police were called after a night of partying with his BVB team-mates in the wake of their cup final loss.

Grosskreutz, who was guilty of a mistake in the build-up to Arjen Robben's opener in the final, explained that he had allowed himself to indulge more than he intended due to the disappointment of the defeat and expressed remorse for his actions.

"I was totally frustrated after the game," he was quoted by Bild am Sonntag.

"We had planned so much, we really wanted to win the cup. I had a blackout. I'm sorry."

This latest indiscretion came after another incident earlier in May where Grosskreutz threw a doner kebab in the face of a Koln fan face during a night out with Dortmund players and has led to a stern warning from Germany boss Joachim Low.

"[Germany team manager] Oliver Bierhoff and had a serious talk with Kevin," the 54-year-old revealed.

"National players are role models, on the pitch as well as off it. We reminded him of this and made it clear to him that such a thing should not happen again.

"Kevin is still young - he is impulsive, he has heart and passion. He shows it when he stands on the pitch. You must also see that Kevin has always behaved properly with the national team. This incident occurred with Borussia Dortmund and there the organisers have already responded."

Grosskreutz is part of the Germany squad for this summer's World Cup, with the Nationalelf preparing for their first Group G game with Portugal on June 16.