Claiborne (hamstring) has been ruled out for Sunday's game in Miami, Armando Salguero of the Miami Herald reports.
With Claiborne unavailable, Byron Jones figures to primarily work as a cornerback, which should free up some extra snaps for safeties Jeff Heath and J.J. Wilcox. Claiborne isn't particularly good, so his absence isn't cause to significantly downgrade the Dallas defense.
Romo will miss the remainder of the season after being diagnosed with a hairline fracture to his left clavicle Friday, Brandon George of The Dallas Morning News reports.
Romo's clavicle won't actually require surgery but he'll still need to sit out the rest of the season after sustaining the break during Thursday's loss to the Panthers. Matt Cassel will seemingly take over from here on out as the Cowboys fade out of playoff contention after Romo's second left clavicle injury in just a matter of months.