UFC President Dana White announced Friday night that welterweight champion Robbie Lawler injured his thumb Friday and was ruled out of his scheduled Nov. 14 title defense against Carlos Condit.
Rousey (12-0) will take on former professional boxing champion
The UFC has yet to determine the new Jan. 2 main event.
Lawler (26-10) made his first title defense in July, scoring a technical knockout of Rory MacDonald in one of the UFC's most compelling fights in history.
Condit (30-8) defeated former welterweight title challenger Thiago Alves in May to earn his second title shot.