Matthew Stafford's wife, Kelly, says she's breaking down emotionally after the Rams quarterback was put in the NFL's concussion protocol this week ... saying straight up, "I'm not OK."

The L.A. star finished the Rams' loss to the Buccaneers on Sunday seemingly without issue -- but according to head coach Sean McVay, members of the team's medical staff found he didn't pass their postgame checkup with flying colors.

Matthew Stafford's wife, Kelly, says she's breaking down emotionally after the Rams quarterback was put in the NFL's concussion protocol this week ... saying straight up, "I'm not OK."

The L.A. star finished the Rams' loss to the Buccaneers on Sunday seemingly without issue -- but according to head coach Sean McVay, members of the team's medical staff found he didn't pass their postgame checkup with flying colors.