Oklahoma State quarterback Spencer Sanders will miss the rest of the regular season after thumb surgery this week, sources told ESPN on Thursday.
Sanders suffered the injury on a pass attempt last Saturday, when his right hand hit an opposing player's helmet on a follow-through in a 31-13 home win over Kansas. His backup, Dru Brown, replaced him, and threw a 43-yard touchdown pass in the third quarter.
Brown should start Saturday as the No. 21 Cowboys (7-3) take on the West Virginia Mountaineers (4-6) in Morgantown, West Virginia.