ALAMEDA - Sebastian Janikowski's left hamstring might hurt more than the Raiders want to let on.
The Raiders worked out kickers Rhys Lloyd, Ricky Schmitt and Dave Rayner after Friday's practice.
"We'll always make sure we protect our football team," Jackson said while not indicating if he thought Janikowski would be out.
Janikowski is officially listed as questionable for Sunday's game against the Kansas City Chiefs.
Jackson said his decision to go for it on fourth-and-1 against Cleveland or to try the fake field goal had nothing to do with Janikowski being injured during the game.
*There is still no announcement from Jackson on who will be the starting quarterback Sunday. Kyle Boller and Carson Palmer have both taken first-team reps.
Jackson has not ruled out playing more than one quarterback. So Terrelle Pryor is still in the mix at some point, but it would still be surprising to see Pryor play this weekend with Boller established with the team and Palmer needing any work he can get to get caught up after missing six weeks of the season.
*Linebacker Rolando McClain (ankle) did not practice and is questionable.
"I think he's not as well as he was a week ago, you know, and so I want to make sure that we're very cautious with him," Jackson said. "Sometimes there's a little bit more rest to it too. So I think it's a combination of both. But still I want to make sure that we're putting healthy football players out there. If he's not healthy enough to go, we won't let him go."
*Only quarterback Jason Campbell (broken collarbone) and cornerback Chris Johnson (groin, hamstring) have been ruled out for the Chiefs game.