Denver Broncos head coach Gary Kubiak has been diagnosed with "a complex migraine condition" after leaving Mile High Stadium in an ambulance on Sunday.
Kubiak had spoken to his team and the media following the 23-16 defeat to the Atlanta Falcons before being taken to the hospital with "flu-like symptoms".
The 55-year-old underwent tests that returned normal results and is expected to be released from hospital on Monday.
A Broncos statement read: "After experiencing flu-like symptoms following Sunday's game, Denver Broncos head coach Gary Kubiak underwent several precautionary tests at a local hospital. These included an MRI and CT scan, both of which came back normal.
"Kubiak was diagnosed with a complex migraine condition that caused extreme fatigue and body weakness. He received medication and is feeling much better with an expected release from the hospital this afternoon."
While coach of the Houston Texans in 2013, Kubiak suffered a transient ischemic attack - frequently referred to as a 'mini-stroke' - and collapsed during a game against the Indianapolis Colts.
Though there has been no indication whether Kubiak might miss time, the Broncos (4-1) face a short week. They are scheduled to play the San Diego Chargers (1-4) on Thursday.