Bayer Leverkusen midfielder Michael Ballack has apologised for his behaviour after recently insulting Cologne supporters.
The former Chelsea star is under investigation by the German Football Association (DFB) after Leverkusen's victory over Schalke last weekend.
Ballack used a megaphone to lead Leverkusen fans in chants against local rivals Cologne following the match and is now facing punishment.
The 34-year-old regrets his actions and has said sorry after his outburst, but he is still expected to be fined by the DFB.
Suddeutsche Zeitung quotes Ballack as saying: "It certainly was not wise of me regarding Cologne, but this can happen in the euphoria of victory, even if it should not."
Ballack added: "I have no problem with the fans of Cologne or the club."