Harrison is unlikely to play in the Dolphins' preseason finale against the Falcons on Friday due to a hamstring injury, Joe Schad of The Palm Beach Post reports.
Harrison likely picked up the injury during the Dolphins' 26-3 preseason loss to the Giants on Saturday. He's battling for a depth spot on the 53-man roster, and his hamstring injury puts him in jeopardy of being cut by the Dolphins at the end of training camp.