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Dolphins make changes to struggling offensive line

MIAMI -- After giving up six sacks Sunday against the Tennessee Titans and 11 in the past two weeks, the Miami Dolphins made significant changes to the depth of their offensive line Tuesday.

Miami cut former third-round draft picks Billy Turner and Dallas Thomas, and the team also released former fourth-round pick Jamil Douglas from its practice squad, sources told ESPN NFL Insiders Adam Schefter and Adam Caplan. All three linemen were once promising prospects for the Dolphins who never reached their potential.

To fill those roster spots, the Dolphins announced they've signed cornerback Chimdi Chekwa and offensive tackle Sam Young.

Turner started at left tackle against Tennessee in place of the injured Laremy Tunsil (ankle) and allowed quarterback Ryan Tannehill to be sacked at least twice. Thomas played multiple positions on the offensive line the past few seasons but couldn't master any of them.

Tannehill has been sacked an NFL-high 201 times since the start of the 2012 season, mostly due to Miami's inability to field a quality offensive line.

The Dolphins (1-4) will host the Pittsburgh Steelers (4-1) on Sunday at Hard Rock Stadium.