Undefeated welterweight Errol Spence Jr. will fight on the Amir Khan-Devon Alexander card Dec. 13 in Las Vegas, Golden Boy Promotions matchmaker Robert Diaz said. His opponent has not been selected.

A 2012 U.S. Olympian, Spence (14-0, 11 knockouts) will be part of a card supported by a clash of unbeatens featuring Keith Thurman opposite Leonard Bundu, three-division titlist Abner Mares in a featherweight bout and former welterweight beltholder Victor Ortiz. Mares and Ortiz will also fight opponents to be determined.

A 24-year-old southpaw, Spence was last in action for a second round stoppage of Noe Bolanos in September that had followed a unanimous decision over Ronald Cruz in June. The victory over Cruz ended Spence’s run of three consecutive knockout victories, two of which were in the first round.