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Bayer Leverkusen have confirmed full-back Michal Kadlec suffered a broken nose after being attacked in a nightclub in Cologne on Saturday night.

The Czech Republic international visited the nightclub with his girlfriend and team-mates after his side's 1-0 Bundesliga win in Hoffenheim.

The club said he was attacked by "two violent men".

Kadlec, who will have surgery on his nose on Monday, told www.bayer04.de: "I want to play on Saturday against Hannover with a face mask, if at all possible."

Bayer director of sport Rudi Voller told Sky television: "He (Michal) could do nothing about it, he is totally innocent.

"I am very disturbed by this. It is a kind of violence that I have never seen before.

"I have never heard of anything like this in 30 years."

Cologne confirmed both men were known to the club, although neither was a club member.

One of them was issued with a four-year nationwide stadium ban in 2010.

Cologne chief executive Claus Horstmann apologised to Bayer and Kadlec for the attack.

He said in a statement on the club's official website: "I learnt of the incident on Sunday and immediately contacted (Bayer chief executive) Wolfgang Holzhauser in order to apologise explicitly in the name of Cologne to Michal Kadlec and Bayer Leverkusen for this attack.

"We will also seek direct talks with Michal Kadlec so we can apologise to him personally and express our regret over this ugly incident.

"We are offering our help with the prosecution and will check promptly what legal options are available to us.

"It is not on that opposition players cannot move around freely in Cologne and that they are attacked just because they play football for a league rival

"We harshly condemn this act."