The Falcons moved Thompson (undisclosed) to the reserve/non-football injury list Sunday, Will McFadden of the team's official site reports.
Thompson spent all of training camp on the active/non-football injury list, making the defensive tackle eligible to start the season on the reserve/NFI list. The 23-year-old is now required to miss at least the first four games of the regular season before being eligible to return to the active roster.