Walter continues to take the majority of reps with Oakland's starting offense while Josh McCown has seen his time with the first-team offense decrease this week. Daunte Culpepper, the third quarterback in the equation, took a few reps with the starters Wednesday but has remained mostly with the backups for now.
Kiffin, who was released from the hospital Wednesday after a two-day stay while being treated for a viral infection, said he knows what his QB rotation will be against the 49ers but won't reveal it until later this week.
That seems to be fine with Walter.
"We're professionals so whatever the coach dictates, that's what we'll do," Walter said. "That's what I intend to continue to do. When you're getting the chance, obviously you try to do the best you can because we're all being evaluated."
Walter, the third-year quarterback who went 2-6 as a part-time starter for Oakland in 2006, was the most effective of the three quarterbacks in the 27-23 win over Arizona last week after replacing McCown in the first half.
Walter completed 8-of-11 passes for 50 yards and a touchdown in his brief time on the field. More impressive was his quarterback rating of 111.9, remarkable considering he had the lowest rating among all NFL quarterbacks a year ago.
"Like I've been telling people, football is a team game," Walter said. "It's never all one player. When everything is working, it looks good.
"That's not a surprise to me or anybody in the locker room. But apparently it is a surprise to people outside, and that's fine."