Dallas Cowboys starting cornerback Morris Claiborne said he ran for the first time Wednesday since he jammed his left knee in practice Aug. 6.

Claiborne who still hasn’t returned to practice said he’ll now wait to see if any swelling develops in his left knee over night before re-evaluating what he can do Thursday in his rehabilitation.

Claiborne said he’s confident he’ll be ready to play in the Cowboys’ season opener Sept. 8 against the Giants. He’s not likely to play in either of the final two preseason games as the Cowboys continue to be cautious with the second-year player.

Cowboys coach Jason Garrett said Claiborne needs preseason snaps however.

“We’ll see where he is physically” Garrett said. “He needs to practice he needs to play. But then you say OK he’s not healthy enough to do that what’s our next best alternative. OK may go into a game where not as much work as you would like him to have.”