Raiders head coach Bill Callahan said that Garner hurt his knee in a 9-on-7 drill in a noncontact situation but could not decipher when or how it took place. Garner underwent an MRI examination that turned out negative.
Callahan added that center Barret Robbins (knee) is listed as questionable but he hopes to have him play "a series or two." Tight end Teyo Johnson (back) is listed as probable but the Raiders plan on using him cautiously for Thursday's game.
The Raiders will return to Napa for Saturday, which will mark the final day of training camp. The team will have been here for 23 days, one of the shorter stints in recent memory.
"The way I look at it, everyone is scaling back," Callahan said. "I keep looking at those injury lists. The key is to come out of the preseason fresh and healthy. With the way things are structured, you would hate like heck to get somebody hurt that's a key player."
Quote of the Day
"I've been demonstrative in terms of my praise for him. I'm very high on him and rightfully so. He has the motor. He has the skills and intelligence to play. Every day is a learning experience for him. I'm not ready to put him in the Hall-of-Fame yet but he has improved his game."
--Bill Callahan on defensive end Tyler Brayton
Wide receiver Jerry Porter flashed his basketball skills by slam-dunking the ball over the crossbar after catching a touchdown pass. … Callahan added that starting quarterback Rich Gannon would likely play a "series or two" against the 49ers with Marques Tuiasosopo, Rick Mirer and Tee Martin getting the rest of the work. … Recently fired University of Washington head coach Rick Neuheisul and FOX analyst Troy Aikman were among the guests on Tuesday morning. Aikman is part of the FOX TV crew that will broadcast Thursday's game nationally.
Vince D'Adamo can be reached at firstname.lastname@example.org