After being downgraded on Thursday’s injury report following a concussion, Dolphins‘ edge rusher Chop Robinson has officially been ruled out ahead of Sunday afternoon’s game against the San Francisco 49ers.

Dolphins coach Jeff Hafley said Robinson suffered the concussion during Wednesday’s practice. It is Robinson’s third concussion within the last year.

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Also ruled out of the game was linebacker Ronnie Harrison, Jr. Primarily a special teams player in Week 1, Harrison has been dealing with a hamstring injury that kept him from practicing all week.

With Robinson sidelined, Josh Uche, Malik Herring, Robert Beal Jr., and potentially Clelin Ferrell, who is currently on the practice squad, are all candidates to see increased workloads. Hafley could also continue deploying defensive tackle Zeek Biggers on the edge, as he did during last Sunday’s loss to the Raiders.

Miami‘s injury report also listed long snapper Tucker Addington as questionable for the game. Addington injured his shoulder in Week 1 but played through the rest of the game.

The 49ers’ side of the injury report included officially ruling out wide receiver De’Zhaun Stribling who did not practice throughout the week with an ankle injury. as well as designating running back Kaelon Black and kicker Eddy Pineiro as questionable. Black was limited in practice on Thursday and Friday after sustaining a groin injury. Pineiro did not practice all week due to an illness.

The Dolphins and 49ers kickoff on Sunday at 4:25 p.m. Eastern.