Chinn recorded 13 tackles (10 solo) during Thursday's 26-18 loss at Philadelphia.
The Commanders and Chinn have agreed to terms on a one-year deal, Jeremy Fowler of ESPN.com reports.
Chinn finished the regular season with 30 tackles (18 solo), including one sack, and one pass defended in 12 games.
Chinn (quadriceps) is active Sunday against the Buccaneers, Darin Gantt of the Panthers' official site reports.
Chinn (quadriceps) was activated to Carolina's active roster Saturday, Mike Kaye of The Charlotte Observer reports.
Chinn (quadriceps) is listed as questionable for Sunday's game at Tampa Bay.
Chinn (quadriceps) is out for Sunday's game against the Titans.
The Panthers designated Chinn (quadriceps) for return from their injured reserve list Wednesday, Darin Gantt of the Panthers' official site reports.
The Panthers placed Chinn (quadriceps) on injured reserve Tuesday.
Chinn is dealing with a significant quad injury and could be out for up to six weeks, Adam Schefter of ESPN reports.