Dolphins at Colts

Miami quarterback Ryan Tannehill is questionable with a knee injury, but he took most of the reps in practice this week. Also questionable is receiver Brian Hartline (groin). Cornerback Richard Marshall is out, with a back injury. His former teammate, Dolphins-turned-Colts cornerback Vontae Davis is out, too, with a knee injury. Colts linebacker Robert Mathis is due to return after missing three games with a knee injury.