NSW captain Boyd Cordner remains desperate to lead the Blues’ first State of Origin clean sweep in 18 years as a troublesome calf injury throws his spot for the series finale in doubt.

Cordner, who is still expected to be named in an unchanged NSW squad on Monday, faces another battery of tests to prove his fitness as Dragons hitman Tariq Sims sweats on a first sky blue jumper.

Out: Boyd Cordner. Credit:AAP

Fairfax Media understands Blues hierarchy have concerns about Cordner’s fitness after picking up the calf complaint in the series-sealing game two win a week ago, in which the Roosters’ co-captain also suffered a heavy concussion in the final minutes.

It could pave the way for Sims, who has been NSW’s 18th man in the opening two games, to make his Origin debut in a straight swap for the Blues’ inspirational leader.