British boxers David Haye and Dereck Chisora are to face each other at Upton Park on 14 July in a fight sanctioned by the Luxembourg Boxing Federation.
Chisora's manager Frank Warren told the BBC he would officially announce the fight at a news conference today
The British heavyweights were involved in a brawl following Chisoras defeat by Vitali Klitchko in Munich.
The British Boxing Board of Control will not sanction the fight because neither holds a British licence.
Chisora had his licence withdrawn after a number of controversial incidents before and after the Klitschko fight but he has appealed against the decision
Haye relinquished his licence when he retired in October last year , three months after losing his WBA title to Wladimir in Hamburg.
Warren had previously said he would not go ahead with a fight between the two boxers.
However, he said he changed his mind because Chisora's appeal against his licence withdrawal had been "pushed back to July".
Chisora was granted a licence to fight by the Luxembourg Boxing Federation but Warren added that "a number of commissions" had been willing to do so.