Falcons rookie running back Devonta Freeman left the field with an undisclosed injury and did not return to practice on Monday.

“I don’t know exactly what happened,” Falcons coach Mike Smith said. “He left the field and was not able to come back out. I don’t think it’s anything serious. But we’ll know a little more in the next hour or two.”

Freeman, a fourth-round draft pick, accounted for 107 total yards on 11 touches in the exhibition opener against Miami. He rushed for 50 yards on 10 carries and caught a pass for 57 yards.

Freeman was pleased with his debut.

“I felt like I did an OK job,” said Freeman after the game. “But I have a lot of work to do with everything and every phase, pass block and runs. Overall, I just have a lot of work to do.”

The Falcons are already hurting at the running back position. Steven Jackson, who’s listed No. 1 on the depth chart, has been out with a left hamstring injury.

With Jackson out and Freeman possibly slowed, Jacquizz Rodgers, Antone Smith, Josh Vaughan and Jerome Smith are the remaining healthy running backs on the roster.