Dolphins running back Lamar Miller has insisted for weeks that he doesn’t mind sharing carries with Daniel Thomas.

But with Thomas out indefinitely after spraining his left ankle Sunday, Miller acknowledges he’s looking forward to having the chance to prove himself as a full-time back.

“I’m pretty sure any running back would,” Miller said.

While Miller is now the undisputed No. 1 back, return man Marcus Thigpen will likely be elevated to No. 2.

In the preseason, rookie fifth-round draft choice Mike Gillislee was the third running back behind Miller and Thomas. But Gillislee doesn’t have a carry this season, and players — including Thigpen — said they expect Thigpen to be Miller’s main backup.

“I’m definitely ready,” Thigpen said. “I’ve been waiting for this opportunity all year. It’s finally presented itself for me, and I just look forward to going out there and taking advantage of it.”

Although Thomas wasn’t having a great season, his loss hurts the team. He leads Miami with three rushing touchdowns, and Miller hasn’t been the standout back many expected him to become when the Dolphins let Reggie Bush sign with Detroit.

Miller is running for just 43 yards per game with two rushing touchdowns.

Center Mike Pouncey said he believes Miller and Thigpen can have success on the ground.

“Most running backs in the NFL have a one-man rotation,” Pouncey said. “Lamar knows he has to go out and play a lot of snaps. When Marcus is in the game, he’s going to do a great job. He’s a guy we believe in a lot. We’ll see how those guys do.”

Thigpen was on the practice squads of the Philadelphia Eagles and Denver Broncos in 2009 before spending three years in the Canadian Football League.

He signed with Miami last year and established himself as a kick and punt returner. He has just three career rushes for 16 yards.

His productivity as a return man is down this season. Thigpen averaged 12.2 yards per punt return last year. But this season he has averaged 8.4 yards and he doesn’t have a punt return longer than 34 yards.

Thigpen still believes he can succeed as a speed back who “can make people miss.”

He also expects Gillislee to receive some carries Sunday against the New York Jets, “depending on how the game goes.”