IRVING, Texas -- Dallas Cowboys running back DeMarco Murray is on the practice field for the third straight day, but the right side of the offensive line -- tackle Doug Free and guard Zack Martin -- isn’t.

Speaking on 105.3 The Fan in Dallas on Friday, Cowboys owner and general manager Jerry Jones said he is “pretty positive,” Murray and Martin will play Sunday against the Indianapolis Colts. The Cowboys are not as sure about Free.

Murray is attempting to play with a broken hand that was surgically repaired on Monday. Free and Martin have ankle injuries. Coach Jason Garrett said there are no hard and fast rules as to whether Martin, a rookie, has to practice in order to play.

As for Murray, Garrett said the running back “looked good,” in Thursday’s practice in which he took limited team snaps but he wasn’t ready to commit to Murray playing against the Colts.

“He hasn’t done much with the ball in his left hand,” Coach Garrett said, “He’s just trying to work his way back. He had surgery a couple of days ago. I think his mind is right, but he has a long way to go. We’ll take it day by day and see how he is come game time.”

Defensive tackle Josh Brent (calf) and linebacker Dekoda Watson (hamstring) are not practicing and will likely miss Sunday’s game. Backup quarterback Brandon Weeden is missing practice for personal reasons.