If the Seattle Seahawks are going to make a late charge toward a fourth straight playoff berth, they’ll do it without Marshawn Lynch.

Lynch underwent surgery Wednesday to repair an injury related to a sports hernia and will be sidelined for at least three or four weeks. But that is the best-case scenario on the recovery and there is a chance that Lynch will miss the remainder of the regular season.

Seattle is hopeful that Lynch will return at some point and will keep the bruising running back on the active roster. But Seattle’s playoff hopes will now be carried by rookie Thomas Rawls.

“The doctor projected that he could get back pretty quickly,” coach Pete Carroll said. “They fixed everything that was wrong and the doctor was very optimistic about his return.”

Lynch consulted with Dr. William Meyers in Philadelphia and the surgery was the final option to correct an abdominal injury that had bothered Lynch for weeks. Lynch first showed up on the injury report with the abdominal problem on Nov. 13, two days before the Seahawks faced Arizona. He played against the Cardinals and Carroll said the injury got worse as the game went on, but the team was optimistic Lynch would be able to play last Sunday against San Francisco.

Instead, Lynch felt he lacked the explosiveness needed to be able to play and was inactive.

Schaub gets chance

Since the beginning of last season, Matt Schaub has thrown exactly 10 passes in NFL competition.

That number will increase significantly over the next few weeks, when the 34-year-old gets the chance to prove he still has what it takes to be a starting quarterback.

With Joe Flacco out for the season with a knee injury, Schaub will take control of the Baltimore Ravens’ offense Monday night against the Cleveland Browns.

To this point, Schaub has watched every play this season from the sideline. So forgive the two-time Pro Bowler if he’s got a little rust on his right arm.

“You can’t afford to have any, so you have to do what you can to shake it off in practice,” Schaub said Wednesday. “Just take a deep breath and go out and cut it loose on Monday night. That’s what this game is all about. Will there be a little rust? Maybe. I don’t know.”

After throwing 10 passes as a backup with Oakland last season, Schaub signed with Baltimore during the offseason to play behind Flacco. Because Flacco never missed a game in his first seven seasons, Schaub anticipated another season of relative inactivity.

All that changed Sunday, when Flacco tore two ligaments in his left knee while closing out a 16-13 win over St. Louis.

Bills sign two more

The Buffalo Bills have signed offensive guard Ryan Groy and receiver Marcus Thigpen.

Groy fills an immediate need after being signed off the Tampa Bay Buccaneers practice squad Wednesday. Starting right guard John Miller is out indefinitely with a high left ankle sprain sustained in a 20-13 loss at New England on Monday.

Groy had three starts in four games as a rookie last year in Chicago.

Thigpen, who doubles as a kickoff returner, was a free agent. He rejoins Buffalo after being cut by the team last month.

To make room on their roster, the Bills released running back Dan Herron and receiver Denarius Moore.