Both welterweights are coming off a loss last month and have jumped at the opportunity for a quick return to get back on the winning track.
They will meet on the undercard of a stacked lineup that is being highlighted by Brock Lesnar vs. Shane Carwin and Tito Ortiz vs. Forrest Griffin.
Larson (26-3) out of Brainerd, Minn. was recently upset by UFC newcomer Mike Pierce at UFC Fight Night 19 by unanimous decision, ending a five-fight win streak. Larson had previously only lost to top 10 ranked fighters in Jon Fitch and Carlos Condit.
Foster (12-4) lost his UFC debut against Rick Story at UFC 103 by arm-triangle submission but came away with a performance impressive enough to earn him the Fight of the Night honor with Story.
The UFC 106 card now appears to feature 11 bouts:
Brock Lesnar vs. Shane Carwin
Tito Ortiz vs. Forrest Griffin
Jon Fitch vs. Ricardo Almeida
Karo Parisyan vs. Dustin Hazelett
Amir Sadollah vs. Phil Baroni
Ben Saunders vs. Marcus Davis
Kendall Grove vs. Jake Rosholt
Jason Dent vs. George Sotiropoulos
Brock Larson vs. Brian Foster*
Fabricio Camoes vs. Caol Uno*
Luiz Cane vs. Antonio Rogerio Nogueira*
*not yet officially announced