The Miami Dolphins reportedly have traded quarterback Ryan Tannehill to Tennessee, where he will back up Titans starter Marcus Mariota.The Dolphins will receive a seventh-round pick in 2019 and a fourth-rounder in 2020, with the Titans also receiving Miami’s sixth-round pick in 2019, according to NFL Network.Tannehill will sign a fully guaranteed one-year, $7 million deal with the Titans, ESPN’s Adam Schefter reported. The value could climb to $12 million with performance incentives.He would have been due a base salary of $18.75 million. The Dolphins will have $13.4 million dead salary cap space with the trade.Tannehill, 30, started 11 games in 2018 and completed 64.2 percent of his passes for 1,979 yards with 17 touchdowns and nine interceptions. He missed five games with an injured throwing shoulder.The Dolphins made the move without a proven quarterback on the roster to replace him, having failed to sign free agents Teddy Bridgewater (Saints) or Tyrod Taylor (Chargers). Luke Falk and Jake Rudock are the only QBs on the Miami roster. Falk has never played in an NFL game and Rudock has thrown five passes in three games, including one interception.