DAVIE, Fla. -

Running back Knowshon Moreno has been activated by the Miami Dolphins after recovering from a left knee injury that forced him to miss the first 12 days of training camp.

Moreno came off the physically unable to perform list before Wednesday's practice and joined the competition for a starting job.

Moreno signed a $3.275 million, one-year contract in March after five seasons with the Denver Broncos. He helped them reach the Super Bowl last year when he had a breakout season, rushing for 1,038 yards, catching 60 passes and scoring 13 touchdowns.

"I feel good," Moreno told reporters after practice.

Moreno said there is no timetable for his return, but he doesn't expect to be in the lineup when the Dolphins play the Atlanta Falcons on Friday night.

"If we can get a guy like Knowshon up in the hole, we've got a chance" offensive lineman Daryn Colledge told Local 10 News.

Lamar Miller and Daniel Thomas were the primary ball carriers last season for the Dolphins, who ranked 26th in the NFL in rushing. Both remain on the roster, and Miller has looked good this summer with the first unit.