He also lost controversial split decision against Vitali Tsypko in a European title bout in Nuremberg in 2005.
Hatton suffered a brutal second-round defeat in his IBO light-welterweight world title bout against Manny Pacquiao in May.
Lawton had contemplated retirement after losing to Manchester's John Murray in a British lightweight title bout in June.
However Chisora insists he will not step aside for Haye after Wladimir Klitschko's withdrawal from their planned title bout.
Magee will be a guest of Dennis Hobson at Ricky Hatton's non-title bout against Jose Luis Castillo in Las Vegas on 23 August.
The Helenius-Gammer fight was set to take place on the undercard of the WBA heavyweight title bout between holder Nikolay Valuev and Ruslan Chagaev.
Sprott, who beat Harrison three years ago, is the replacement for Poland's Albert Sosnowski, who pulled out of a proposed title bout earlier this month.
BBC: Audley Harrison faces Michael Sprott for European title
Lionel Rose, who made Australian sporting history in 1968 by becoming the first indigenous boxer to win a world title bout, has also passed away.
Johnson beat Tarver on a split decision in an IBO title bout in December 2004, but Tarver gained revenge with a split decision of his own last June.
"Roman is giving me that fear factor and that is going to give me the edge in this fight, " said Burns ahead of his title bout with the Puerto Rican.
Promoter Frank Warren insisted he will not rush Khan into a world title bout just yet and feels his fighter needs another contest before he goes for the big time.
The Cuban had killed two men in the ring - including the excellent former champion Davey Moore in their title bout - though the belief was growing that Ramos had passed his peak.
Peterson does have the option of refusing the rematch, which must take place within 180 days, but it would mean the 27-year-old relinquishing the WBA title he won in the unification bout.
Despite the setback, Khan is determined to come back stronger and build his way towards a world title fight and he is eyeing a comeback bout before the end of 2008.
The bout is for the vacant WBO intercontinental cruiserweight title, with the winner expected to go on to challenge for the WBO world title.
Cook was denied a title shot last year when Scott Harrison withdrew from their scheduled bout at short notice.
Gavin, 23, knocked out Graham Fern in his third professional bout on the undercard of Khan's WBA title fight with Andreas Kotelnik on Saturday.
Pavlik, fighting in his home town of Youngstown, Ohio, went into the bout following a defeat by Bernard Hopkins in a non-title contest last October.
Warren has decided DeGale can wait no longer to fight again following his title success over Paul Smith in December, in only his ninth professional bout, and he will take on an unnamed opponent at Braehead Arena.
Arthur, who floored Gogoladze three times before his bout was stopped, does not care if he gets the world title by default should Guzman fail to defend it.
Perhaps if his bout with Aberdonian Lee McAllister in October 2007 for the vacant WBU lightweight title had resulted in a different outcome, Docherty would have been encouraged to make a greater effort.
The bout will be the chief supporting contest to Bernard Dunne's European super-bantamweight title defence against Spain's Kiko Martinez.
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