"Of course we still want to talk to Mr Haye and question him to find out about his involvement," Munich police spokesman Wolfgang Wenger said.
"There are of course investigations centered on him and the prosecutor will decide here how to get hold of him, whether this will happen in England or here. The judiciary must decide how to proceed."
Haye, who has gone to ground, had been attending the bout and news conference as a television pundit and his manager Adam Booth suffered nasty facial cuts in the violent brawl.
The British Boxing Board of Control General Secretary Robert Smith said both Chisora and Haye, who retired in October, could face life bans.
"It's a possibility," Smith told BBC Radio 5 live. "The board have many powers. They can fine, they can suspend and they can withdraw a licence."
British media reports said Chisora had threatened to "shoot and burn" Haye.
Police spokesman Wenger added: "We need to question Mr Haye and the others who were involved and then we need to decide if there will be further questioning. The investigations are underway and these need time and thoroughness.
"It wasn't very easy to see immediately what exactly happened.
"This is also part of the investigations. From what we can see in the videos, and of course there may also be other evidence, it seems to be a case of assault, as well as suspicion of grievous bodily harm because perhaps a bottle or tripod was also used to hit someone.
"This is grievous bodily harm. A threat would be if an actual threat was made to the life of another. This still needs to be clarified."
Haye, beaten in July by Vitali's younger brother Vladimir in Hamburg, retired in October but was offered a way back with a fight against the senior Klitschko this year.
Haye became agitated by comments made by Klitschko's manager, Bernd Boente, that he would no longer get a fight with the older sibling and the situation degenerated when Chisora got up to confront his fellow Briton.
(Reporting by Reuters Television; Editing by Mark Meadows)