Bayer Leverkusen are considering terminating defender Emir Spahic's contract as the Bosnia international is being investigated by police for allegedly assaulting a club steward.

The 34-year-old, who is currently injured, is accused of headbutting a steward during a stadium altercation following Bayer's German Cup quarter-final defeat at home to Bayern Munich last Wednesday.

Spahic, who captained Bosnia and Herzegovina at the 2014 World Cup, is being investigated by state prosecutors on suspicion of aggravated assault.

The Bosnia centre-back has a year left on his contract, but his Leverkusen future hangs in the balance.

"I can only repeat, without wishing to anticipate anything, that we will announce a decision very soon: either Sunday or Monday," Leverkusen's director of sport Rudi Voeller told Sky Sports before Saturday's 3-2 league win over Mainz.

"He still has a contract and there are lawyers dealing with the matter.

"He is very sorry for the incident and we mustn't allow our good recent performances to be ruined. Not by anybody.

"We will support the police and certainly the German Football Association (DFB).

"Nevertheless, he is our player and we have a certain duty of care, which is what we have told him.

"But the fact is clear that we are also thinking about how we can proceed, or not, with him."

This is not the first time Spahic has been accused of violent behaviour, following an incident involving Leverkusen's press spokesman in 2013.

Leverkusen captain Simon Rolfes dedicated Saturday's win over Mainz to the injured steward.

"We hope the steward gets well soon. He is also a part of our club. The win is for him," said the ex-Germany midfielder.