The Cowboys agreed to a three-year contract with left guard Kyle Kosier, a league source said Wednesday. The deal is expected to be worth around $9 million.

The season will crumble for the Dallas Cowboys if they can’t protect QB Tony Romo and open holes for the running game.

The Cowboys will find out if Doug Free can handle the job of protecting Tony Romo’s blind side during camp, but he drew strong praise from coach Wade Phillips on Thursday.

Soon after the Redskins landed restricted free agent OT Jammal Brown in a trade with the Saints, it was reported that the Cowboys had shown interest as well.

Cowboys OLB DeMarcus Ware sat out practice Thursday with a back injury, and RB Marion Barber also was added to the injury report with a knee problem.

Dallas Cowboys RT Marc Colombo suffered an apparent lower left leg injury during the first quarter of Sunday’s game against the Green Bay Packers and has been replaced by backup OT Doug Free.