Kansas City Chiefs defensive lineman BJ Thompson suffered a seizure during a special teams meeting Thursday and went into cardiac arrest, NFL Network Insider Tom Pelissero reported.
Kansas City's medical staff worked quickly before an ambulance was called, and Thompson is currently in stable condition, Pelissero added.
"BJ is still unconscious at this point, but he's stable and vitals are good," Thompson's agent, Chris Turnage, told Pelissero Thursday night. "His family asks for your continued prayers."
The Chiefs cancelled all team activities scheduled for Thursday.
Thursday's media availability for head coach Andy Reid and select players has been re-scheduled for Friday.
Thompson, a 2023 fifth-round pick, appeared in one game during his rookie season.
The reigning Super Bowl champions are currently in Phase 3 of their voluntary offseason program. Mandatory minicamp is scheduled to begin on Tuesday.
