The Cowboys believe Tony Romo will be fine, but according to ESPN they are making contingency plans just in case he has a setback during rehab.
Part of that plan is working out other quarterbacks, the latest being former Eagles Mike Kafka. The only other QB on the roster besides Romo is Kyle Orton.
It would be wise for the Cowboys to have some depth at the QB position especially if Romo needs a longer time to heal than expected.