Dolphins coach Tony Sparano wouldn't announce which quarterback he plans to start today against the Raiders (he's deciding between Chad Henne and Tyler Thigpen), because the coach feels the secrecy gives his team "a competitive advantage."

He's got nothing on Raiders coach Tom Cable.

Earlier this week, Cable said Jason Campbell was the starting quarterback and "there is no issue there." But he had Bruce Gradkowski taking most of the first-team snaps in practice all week, and Gradkowski will start today against Miami, league sources have verified.

Dolphins QB Chad Henne (knee questionable) took limited practice reps Friday. Henne still has a brace on his knee, but reportedly has been taking his share of the reps along with QB Tyler Thigpen. Henne's injury is proving much less serious than initially feared. The Dolphins are expected to announce a quarterback shortly before kickoff and Henne appears to be the early favorite. Neither is a fantasy option with Brandon Marshall missing from an already struggling offense.

Dolphins QB Chad Henne (knee) took limited reps Wednesday. Henne still has a brace on his knee, but reportedly was taking his share of the reps along with QB Tyler Thigpen. Henne's injury is proving much less serious than initially feared. He could return this week but wont be a fantasy option regardless. The Dolphins are expected to announce a quarterback shortly before kickoff.

Tyler Thigpen said Sparano met w/ him & Chad Henne after practice Monday and told both to prepare as starters. The coach plans to decide later in week.

And Dolphins spokesman confirms that QB Tyler Thigpen will, indeed, start tonight at QB.

Dolphins QB Chad Henne (knee doubtful) did not practice Wednesday and is doubtful for Thursday Night Football. Tyler Thigpen will get the start, but shouldn't be started against a good Bears defense.

Dolphins QB Chad Henne (knee doubtful) did not practice Wednesday and is doubtful for Thursday Night Football. Tyler Thigpen will get the start, but shouldn't be started against a good Bears defense.

Bears

OUT
LB Pisa Tinoisamoa (knee)

PROBABLE
CB Zackary Bowman (foot), WR Rashied Davis (quadricep), WR Devin Hester (shoulder), WR Johnny Knox (ankle)

Dolphins

OUT
C Joe Berger (knee), S Chris Clemons (hamstring)

DOUBTFUL
QB Chad Henne (knee)

QUESTIONABLE
S Tyrone Culver (ankle), T Jake Long (shoulder), WR Roberto Wallace (knee)

PROBABLE
S Yeremiah Bell (toe), T Vernon Carey (knee), LB Channing Crowder (ribs), LB Karlos Dansby (elbow), LB Tim Dobbins (ankle), DE Kendall Langford (ankle), LB Cameron Wake (hip)

Tyler Thigpen will draw the start for the Dolphins.

The Dolphins have all-but-confirmed that Tyler Thigpen will be their starting quarterback on Thursday against the Bears.

Dolphins third-string quarterback Tyler Thigpen likely will start Thursday night's game against the Chicago Bears after starter Chad Pennington and backup Chad Henne left Sunday's victory over the Tennessee Titans with injuries, a team source told NFL Network's Michael Lombardi.

Multiple sources are reporting that both quarterbacks could be finished for the season.

The Dolphins will almost certainly sign at least one quarterback from free agency or the practice squad to backup Thigpen. Former No. 1 pick Jamarcus Russell is among the names under consideration, the Miami Herald reports.