German prosecutors have confirmed that David Haye and Dereck Chisora are suspected of offences punishable by prison sentences, according to reports, while Chisora has been called in by Britain's boxing authorities.

The BBC report that police suspect Haye of grievous bodily harm. If the former world heavyweight champion were found guilty, he would face a minimum term of six months in jail.

German authorities have confirmed that they want to question Haye.

"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 centred 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...

"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."

Chisora, who was released without charge after being detained in Munich Airport yesterday, is suspected of malicious injury, which could carry a sentence of up to five years, as well as a 'threat', which if proven could be punished by a fine or a jail term of up to one year.

Zimbabwe-born Chisora has also been called to appear in front of the British Boxing Board of Control at a hearing on March 14.

"Mr Dereck Chisora has been called to appear before the Stewards of the British Boxing Board of Control on Wednesday, 14th March 2012 under Regulation 25 (misconduct) with regard to his behaviour prior, during and after his contest for the World Boxing Council Heavyweight Championship against Vitali Klitschko," a BBBC statement said.

The Board of Control has the right to impose financial penalties, sporting suspensions or even withdraw Chisora's boxing licence; having retired, Haye is not under the organisation's jurisdiction but could find it difficult to reapply if he wishes to make a comeback.

The boxers clashed in the press conference following Chisora's defeat at the hands of WBC champion Vitali Klitschko.

Chisora mocked Haye, who was covering the fight for television, for his poor performance in losing to Vitali's brother Wladimir last year and tried to talk him into an all-British fight after the Klitschkos' manager said the brothers were finished with British fighters after protestations from Haye at the back of the room.

Chisora apologised for his part in the brawl, accusing Haye of striking him with a bottle but accepting his responsibility for the debacle.

"I feel I must wholeheartedly apologise for my part in the regrettable scenes both before and after what was to be the biggest night of my career," he said.

"Whilst my behaviour was inexcusable, there were many things that went on behind the scenes that ultimately caused my frustrations to boil over, however this is of course no excuse. 

"I cannot go into the specific details at the moment as quite rightly the British Boxing Board of Control will be investigating this matter and also the altercation that took place between David Haye and myself where I was struck by a bottle.

"Despite all of this, the bottom line is, I have let my family, my team and worst of all the sport I love down. I acknowledge that my actions were totally unprofessional, with or without provocation."

Haye has released a statement to say he will assist the authorities in any investigation - but stopped short of saying sorry for his part in what happened.

"I realise I am no angel - and don't mind a bit of professional trash-talk to help raise boxing's profile - but, during my 21 years in the sport, I have never been involved in, or even witnessed, such a serious fracas," the statement read.

"If requested, I shall happily assist the boxing authorities with any investigation they wish to launch and, ultimately, hope that all lessons learned from this incident will be implemented.

"I also hope Dereck Chisora is able to learn from his mistakes this past weekend, right the wrongs and then go on to fulfil his potential in the boxing ring."

After giving his side of the incident, Haye explained why he had already left Germany by the time police had arrived at his hotel.

"Thankfully, it didn't take long for the ruckus to again settle down. It was then that I heard Chisora say he planned to 'shoot me dead'," he said.

"I decided to leave the venue and return to my hotel, a move which I hoped would diffuse [sic] the situation.

"However, Chisora's team were staying at the same hotel as me and, in light of the threats Chisora had made in front of the world's media, it seemed far more appropriate for me and Adam to leave the hotel as quickly as possible.

"Consequently, I left Munich on an earlier flight on Sunday morning."

Warning: video contains bad language

British Boxing Board of Control general secretary Robert Smith refused to rule out the possibility of life bans for the shamed boxers.

"It's a possibility," Smith told BBC Radio 5 live. "They could fine, they could suspend, they could withdraw a licence, they have many powers."

Smith has also signed his name to a statement from the body to say it was investigating Chisora's behaviour.

"The British Boxing Board of Control are looking at the behaviour of British Boxing Board of Control licensed boxer Dereck Chisora prior, during and after his contest for the World Boxing Council Heavyweight Championship against Vitali Klitschko on Saturday, 18th February 2012 in Munich," it read.

"The stewards will be considering Mr. Chisora under Regulation 25 (misconduct) and a further statement will be issued once the stewards have decided on what action will be taken.

"With regard to Mr. David Haye, Mr. Haye is not a licensed Boxer with the British Boxing Board of Control and therefore no longer under the jurisdiction of the British Boxing Board of Control."

Haye's trainer Booth said that Haye had nothing to hide from police.

“We have not been contacted or called by the German police," Booth was quoted in the Daily Telegraph. "Of course we would answer any questions, and would go to Germany to be interviewed. We have nothing to run away from.

“What David did was a defensive reflex. The man said he was going to slap him, walked 20 yards towards him, took his jacket off, went straight into a headbutt and shoved his fist into David’s chin. Everything was a defensive reflex from David.”

Eurosport