The Dolphins, according to a league source, released veteran defensive end Tank Carradine for the second time in a month Tuesday, leaving Miami with only one defensive lineman or linebacker who has played more than three years in the NFL.
To fill the roster spot, the Dolphins signed offensive tackle Andrew Donnal, who has played in 29 games with six starts over four seasons. He played in 21 games (with six starts for the Rams) in 2015 and 2016, appeared in six games with Baltimore in 2017 and two with Detroit last season.
The Rams selected him in the fourth round out of Iowa in 2015.
Donnal is needed because the Dolphins lost two offensive linemen during Sunday’s game. Coach Brian Flores said both of those players — tackle Jesse Davis (arm) and guard Danny Isidora (foot) — are “upbeat” about their chances of playing Sunday.
With Davis leaving Sunday’s game, the Dolphins needed to move guard Michael Deiter to left tackle. J’Marcus Webb, the starting right tackle, was the only healthy offensive tackle on the roster.
Carradine, who started the first three preseason games for Miami, was released Aug. 31 and then re-signed before the Week 2 game against the Patriots.
He had three tackles playing off the bench against New England but was inactive for Sunday’s game against the Cowboys, with Miami instead choosing to play Taco Charlton, who was claimed off waivers from Dallas last Thursday.
Carradine’s release leaves John Jenkins as Miami’s only front seven defender with more than three years of NFL experience.
The Dolphins edge players now include two third-year players in Charles Harris and Charlton, a second-year player who made his NFL debut Sunday (Trent Harris) and a third-year player in Avery Moss, along with third-year linebacker Vince Biegel.
LOW TV RATING
The lopsided nature of the Dolphins’ first few games this season — and the team’s rebuilding strategy — was bound to have an effect on the number of people interested in watching the games.
But even so, the 9.5 local rating for Sunday’s Dolphins-Cowboys game was surprisingly low because it’s rare for any home team to draw a single-digit rating in its own market. Though no records are kept, I cannot recall any Dolphins game on free television registering a rating that low.
That means 9.5 percent of Miami-Fort Lauderdale homes with television sets watched the game on local television. According to nocable.org, one local ratings point in Miami-Fort Lauderdale equals 16,963 homes.
In recent years, Dolphins games have been hovering in the 13 to 16 range for local ratings.
CBS is sending Sunday’s Dolphins-Chargers game to only seven markets: Miami-Fort Lauderdale, West Palm Beach, Naples-Fort Myers, Los Angeles, Palm Springs, San Diego and Yuma, Arizona. Its seventh-string NFL announcing team — Philadelphia Phillies TV voice Tom McCarthy and former Dolphins kicker Jay Feely — will work the game.