NCAA FB

Michigan State DB Williamson has bicep surgery, will miss extended time

Sep 12, 2015; East Lansing, MI, USA; Michigan State Spartans linebacker Riley Bullough (30) and safety Rj Williamson (26) defend Oregon Ducks wide receiver Byron Marshall (9) during the fourth quarter at Spartan Stadium. Spartans beat the Ducks 31-28. Mandatory Credit: Raj Mehta-USA TODAY Sports

Sep 12, 2015; East Lansing, MI, USA; Michigan State Spartans linebacker Riley Bullough (30) and safety Rj Williamson (26) defend Oregon Ducks wide receiver Byron Marshall (9) during the fourth quarter at Spartan Stadium. Spartans beat the Ducks 31-28. Mandatory Credit: Raj Mehta-USA TODAY Sports

EAST LANSING, Mich. -- Michigan State defensive back RJ Williamson will miss an extended period of time after having surgery Sunday on a torn bicep.

The fourth-ranked Spartans have had to deal with several major injuries this season. Linebacker Ed Davis, defensive back Vayante Copeland and offensive lineman Dennis Finley are out for the season, and offensive lineman Jack Conklin and tight end Josiah Price also went down with injuries recently.

Williamson, a fifth-year senior, has intercepted two passes this season.

More from FoxSports

Michigan State plays at Rutgers on Saturday night.