Two of the players went to a hospital following the crash.
Thomas could still start Saturday at Washington State. He was in the passenger seat of a Ford Mustang driven by teammate Eddie Pleasant and suffered a bruised elbow on his right throwing arm.
"[Thomas] is fine," Oregon coach Mike Bellotti told The Oregonian.
Pleasant was cited by Springfield police for reckless driving and speed racing. Freshman linebacker Pleasant, 19, and sophomore receiver Jamere Holland, 20, will miss Saturday's game because of injuries suffered in the accident, Bellotti said.
Bellotti said Thomas and Holland probably will not be disciplined. He has not made a decision on Pleasant.
"Any time an accident occurs, the stories differ just a little bit on what happened," Bellotti told The Oregonian. "[Pleasant] was cited by the police so I assume he was at fault."
Pleasant needed 75 stitches to close an approximate 1-inch gash on his forehead and Holland suffered a concussion. Both were admitted to a hospital and released Thursday morning.