Set for January 2 from Las Vegas, the card features Robbie Lawler defending his welterweight title against Carlos Condit in the main event.
Westcott (8-3-1) and Garcia (14-4) are both still searching for their first Octagon win after losing all five bouts.
Below is the current lineup:
UFC Welterweight Championship
Robbie Lawler (c) vs. Carlos Condit
Lightweight: Erik Koch vs. Drew Dober
Welterweight: Sheldon Westcott vs. Edgar Garcia