Raiders place Tuiasosopo on injured reserve
Coach Bill Callahan said at this point Tuiasosopo won't have surgery.
"He's down," said Callahan, who met with Tuiasosopo on Tuesday and again Wednesday. "The guy's out for the year. It was going to be tough to get him back. It's going to be at least six weeks."
The Raiders filled his roster spot with practice squad quarterback Tee Martin. Oakland also signed quarterback Rob Johnson on Tuesday, and Johnson will likely be the No. 3 quarterback for Sunday's game against the New York Jets behind starter Rick Mirer and Martin.
Also Wednesday, the Raiders said they signed offensive lineman Matt Knutson and running back Keith Burnell to the practice squad and waived defensive back Carey Scott.
Tuiasosopo, a third-year pro, made his first NFL start in place of injured 2002 MVP Rich Gannon in last Sunday's 23-13 loss at Detroit, but didn't last long. On Oakland's third offensive series, he bobbled a snap, then ran up the middle and fumbled on a hard hit by Boss Bailey. Tuiasosopo stayed in the game for two more possessions before being sidelined.
Gannon hasn't thrown a pass since going down in the Raiders' 17-10 loss to Kansas City on Oct. 20. He is expected to begin throwing again in about a week.
This story is from ESPN.com's automated news wire. Wire index