Cal star tailback Jahvid Best has been ruled out of Saturday's regular-season finale at Washington, the third consecutive game he will miss.

Best hasn't played since suffering a severe concussion and a back injury during the Bears' 31-14 loss to Oregon State on Nov. 7. Best spent Tuesday in Pittsburgh visiting with Dr. Michael Collins of the University of Pittsburgh Medical Center. Collins is considered one of the nation's leading experts on sports concussions.

Cal coach Jeff Tedford said Best hasn't felt any concussion symptoms for a couple weeks, and the back injury is what is keeping him from returning to action. Still, the team wants to be extra cautious about Best's health.

"His head has been doing fine," Tedford said. "It's still just making sure that the head is 100 percent completely clear, and we've given it a lot of time. It's something that we said after that happened, that we'd by no means take any risk or anything like that with him. He's back there just getting evaluated to make sure that everything is OK."

It is unclear if Best will return for a bowl game. Best, a junior, is considering leaving Cal after the season and entering the NFL draft.