Gary Kubiak collapsed as the team left the field at halftime. (David J. Phillip / AP)

Houston Texans Coach Gary Kubiak suffered a mini-stroke as he left the field at halftime Sunday night and is expected to continue treatment in a Houston hospital today.

Kubiak, 52, was stricken with a transient ischemic attack (TIA), the NFL Network’s Ian Rapoport reports. A TIA occurs when a blood clot temporarily blocks the flow of blood to the brain, according to the American Stroke Association, and is usually brief. The loss of function is temporary and reversible, according to the Mayo Clinic. However, it’s a warning sign and the Mayo Clinic says that one in three people who have a TIA eventually suffer a stroke.

ESPN’s Adam Schefter cited unnamed sources who said the coach is “feeling good” and is with his family as his treatment proceeds. Options for treatment, according to the Mayo Clinic, range from drugs to surgery to clear the carotid arteries to angioplasty. It is unclear what treatment Kubiak is receiving and when he might return to the team. Defensive coordinator Wade Phillips filled in for Kubiak during the second half of the team’s loss to the Indianapolis Colts.

“Gary is alert, coherent and in good spirits,” General Manager Rick Smith said Monday. “He is continuing to be evaluated and monitored.”