Brook vs Chaves undercard: Chris Eubank Jr to face Tony Jeter on October 24

Rising middleweight contender Chris Eubank Jr will make his debut under the Matchroom Boxing banner on October 24 as part of the Kell Brook-Diego Chaves undercard, facing Tony Jeter in Sheffield, with a fight against Gary O'Sullivan waiting in December if Eubank wins.

Eubank (19-1, 14 KO) beat Dmitry Chudinov in February, which followed a narrow loss to Billy Joe Saunders last November. He signed with Matchroom just a couple of weeks ago, and they immediately made plans to have him fight on their two biggest scheduled cards with 2015 coming to a close.

Jeter (20-4-1, 14 KO) should be little more than a tune-up for Eubank. At 39, Jeter is 13 years Eubank's senior and despite nonsense top 15 rankings with the WBA, WBC, and WBO, is a club fighter who was shellacked in two rounds by Patrick Nielsen in 2014. Since then, he's won four straight over limited competition.

The bigger news is that with a victory, O'Sullivan (21-1, 14 KO) will be next up for Eubank on the Anthony Joshua-Dillian Whyte card on December 12, or at least that's the current plan. "Spike" O'Sullivan, 31, has his own tune-up fight this Saturday in Lowell, Massachusetts, where he'll face David Toribio (21-15, 14 KO) in a 10-round bout, part of the non-televised PBC on NBCSN undercard.