Thurston a doubt for Origin opener with shoulder injury

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Johnathan Thurston's State of Origin farewell could be disrupted by a shoulder injury sustained while on international duty with Australia.

The 34-year-old half-back, a three-time Rugby League World Golden Boot winner, is set to retire at the end of the next season, though he plans to stop playing representative matches after 2017.

Thurston has featured in a record 36 consecutive Origin matches for Queensland Maroons but could miss this year's series opener on May 31 after sustaining a shoulder injury on his comeback from a calf problem in the 30-12 Anzac Test victory over New Zealand on Friday.

North Queensland Cowboys confirmed the half-back was set to undergo scans on Saturday, though they do not expect the results to be known until Monday.

Queensland will already be without Greg Inglis and Matt Scott due to serious knee injuries, and coach Kevin Walters hopes Thurston will not become another influential absentee.

"We are aware that JT has a shoulder issue but we'll wait for the scans and official diagnosis from the Cowboys," Walters said in a statement.