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Allen Park – The Detroit Lions enter their final week of practice with a pair of starters in concussion protocol.

Despite returning to practice in a limited capacity last Friday, center Travis Swanson has yet to be cleared. He’s missed the past two games after symptoms manifested following the team’s Week 14 game in Tampa Bay.

Swanson is at risk of finishing his second consecutive season sidelined by a concussion. He missed the final five games last season – four in the regular season and Detroit’s playoff loss in Seattle. The timing couldn’t be worse for the fourth-year pro, who is set to be a free agent at season’s end.

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Joining Swanson in concussion protocol is cornerback Nevin Lawson, who was removed from Sunday’s game against the Bengals in the third quarter.

Lawson has started all 15 games for the Lions, but has seen his role reduced from a year ago. He’s averaging 21 few snaps per game in 2017. He’s also set to be a free agent after this season.