A concussion has clouded D.J. Fluker’s availability for Sunday.

The Chargers right tackle was diagnosed with the injury Wednesday after practice, coach Mike McCoy said. It’s the second concussion in as many years for the 2013 first-round pick, whose official status for Sunday night versus the Patriots will be submitted with Friday’s injury report.

Swing tackle Willie Smith took first-team reps in his place.

He’s expected to start at right tackle should the 23-year-old be inactive.

The only missed start of Fluker’s career came in Week 3 of last year. Concussed when colliding with a teammate in practice on the Wednesday before a Sunday game, he was listed as questionable to face the Titans but did not play. Fluker, a physical and high-energy tackle, has played through several ailments in the time since, including an ankle and knee injury this season.

via Michael Gehlken of UTSanDiego.com