The veteran quarterback will not participate in next week's workouts, and it's unknown when he'll return to action.

With Stafford sidelined, the Rams have been leaning on another veteran, 33-year-old Jimmy Garoppolo. Garoppolo, who has 64 starts across stints with the New England Patriots, San Francisco 49ers, Las Vegas Raiders and the Rams, has been leading the first-team offense throughout camp and would take the reins as QB1 if Stafford misses any time.

Stafford, 37, has not practiced since the Rams opened training camp while receiving treatment from trainers and the team medical staff for what McVay initially described as back soreness. McVay said last Tuesday that Stafford would sit out the first block of practices, but return on Monday when the Rams will be in pads for the first time.