Cowboys ace Johnathan Thurston is set to miss up to four weeks with a calf injury.
The Maroons and Kangaroos half suffered the injury in the Cowboys’ 26-16 loss to the Tigers on Saturday night.
Queensland will be sweating on the health of the Origin hero ahead of Game I on May 31.
Primary Cowboys playmaking duties will fall on No.6 Michael Morgan.
Teen sensation Kaylan Ponga could slot in at halfback.