The field for Betfair Prizefighter International Heavyweights III has been finalised by the addition of four more boxers.
Claus Bertino, Timo Hoffmann, Derric Rossy and Albert Sosnowski will round out the tournament at York Hall in Bethnal Green on 23 February.
Polish mauler Sosnowski (47-5-2) has held the WBF world title during his 15-year career, and had a shot at Vitali Klitschko in 2010, while German fighter Hoffman (40-7-2) has boxed nearly 350 rounds in his lengthy career.
Danish boxer Bertino (15-4) and New York's Rossy (26-5) complete a line-up which shares a total of 135 knockout wins in 262 fights.
They join four boxers who had already been confirmed as participants for the 29th event in the series, including previous champion Audley Harrison and fans favourite Martin Rogan.
The field also features London fighter Ian Lewison (6-1-1) and American knockout king Travis Walker (39-8-1).
The Betfair Prizefighter International Heavyweights III is followed by a pro debut for Team GB's Olympic boxing captain Tom Stalker, who will be in four-round action against Kristian Laight.