Rivers injured his medial collateral ligament when he landed awkwardly after completing a 56-yard screen pass to Darren Sproles for a touchdown on the final play of the third quarter in Sunday's 28-24 upset of Indianapolis.

Coach Norv Turner compared Rivers' situation with that of tight end Antonio Gates, who dislocated his left big toe in a wild-card win over Tennessee, sat out practice all week and then played against the Colts.

"Right now it's probably questionable in terms of playing in the game, but he's got a chance," Turner said today. "That will be a day-to-day thing and we'll monitor it as the week goes on."

Billy Volek took over and led the go-ahead drive, scoring the winning touchdown on a 1-yard sneak.