Dolphins QB Ryan Tannehill ACL/MCL sprain in left knee

— -- DAVIE, Fla. -- The Miami Dolphins received some good and surprising injury news Monday when quarterback Ryan Tannehill was diagnosed with an ACL and MCL sprain in his left knee, head coach Adam Gase confirmed.

According to Gase, surgery is not required but the team still isn't sure if Tannehill will return this season. Backup quarterback Matt Moore will take over the offense this week as Miami (8-5) prepares for the New York Jets (4-9).

The Dolphins were bracing for the worst Sunday evening after Tannehill was hit low late in the third quarter by Arizona Cardinals defensive lineman Calais Campbell. Tannehill left the locker room on crutches. Before the injury, Tannehill is one of the NFL's most durable quarterbacks. He hasn't missed a start in nearly five seasons.

If Tannehill, 28, doesn't return this season, he made quality strides in his first year under Gase. Tannehill posted the first winning season of his career and threw for 2,995 yards, 19 touchdowns and 12 interceptions. He also finished with a career-high 93.5 passer rating.

The Dolphins trail the Denver Broncos (8-5) for the final wild-card spot in the AFC via tiebreakers. Miami will play three consecutive division games to wrap up the regular season.