Atlanta Falcons coach Mike Smith announced Saturday that three-time Pro Bowl linebacker Lofa Tatupu sustained a pectoral injury while working out recently.
"At this point, we do not know the extent of the injury, but we expect to have more information early next week," Smith told the team's website.
The Falcons open training camp on Thursday.
Atlanta signed Tatupu in March after missing last season with an injury. Tatupu spent six years in Seattle, earning three Pro Bowl nods and one trip to the Super Bowl with the Seahawks.