The Dolphins signed Sinnett to their practice squad Monday, Aaron Wilson of ProFootballNetwork.com reports.
After being cut from Philadelphia's practice squad in September, Sinnett is getting another opportunity with a new team less than a month later. Barring another injury in Miami's quarterback room though, the 25-year-old signal caller will likely just spell Teddy Bridgewater and Skylar Thompson during practices until Tua Tagovailoa (concussion) returns.