Cox, who spent most of the past three seasons playing behind Matthew Stafford, the No. 1 pick in this year's NFL draft, has been sick for the last "two to three days," according to a person with knowledge of the situation. Cox was getting fluids Friday in Athens and was scheduled to take a later flight to Stillwater, Okla., the source said.
Cox, a senior from Charlotte, N.C., played sparingly the last three seasons, completing 33 of 58 passes for 432 yards with five touchdowns and one interception. If Cox can't play, sophomore Logan Gray would probably start at quarterback for the No. 13 Bulldogs. Gray, from Columbia, Mo., returned punts for the Bulldogs last season, but hasn't attempted a pass in his college career.
Georgia will also bring two freshman quarterbacks to Oklahoma State -- Aaron Murray and Zach Mettenberg.
The Bulldogs will already be missing sophomore tailback Caleb King, who probably won't make the trip to Oklahoma State after missing most of preseason camp with a strained hamstring. Sophomore Richard Samuel will replace record-setting tailback Knowshon Moreno in Georgia's backfield.
Mark Schlabach covers the SEC for ESPN.com.