Linebacker Jeff Ulbrich tore his bicep muscle Sunday trying to make a tackle on Colts' running back Edgerrin James.
"After I made the tackle, I looked down and my bicep was rolled up and off to one side," Ulbrich told the San Francisco Chronicle.
Ulbrich now has to decide whether to have season-ending surgery or play through the pain.
Ulbrich Tears Bicep Muscle