D’Andre Swift has practiced sparingly this summer while dealing with a lingering groin injury, and now there’s concern the injury could affect his availability for the start of the regular season, too.

Detroit Lions coach Dan Campbell said Tuesday he is not yet sure whether Swift will be full go for the team’s Sept. 12 opener against the San Francisco 49ers.

“Swift concerns me a little bit just with getting his wind back and being able to take a blow and how much can he (play), where he’s at,” Campbell said. “He’ll be out here (practicing Tuesday). He’ll be more involved than he’s been. But those are the (injuries I’m worried about), to be honest with you.”

Swift practiced occasionally during the first two weeks of camp, often limited to individual drills.

He returned for Monday’s one-on-one period — where he ran routes on linebackers in passing drills — but has not played in either of the Lions’ two preseason games and will not be available for Friday’s exhibition finale against the Indianapolis Colts.