Houston Texans coach Gary Kubiak suffered a transient ischemic attack, also known as a mini stroke, when he collapsed on the field during halftime of Sunday night's 27-24 loss to the Indianapolis Colts, NFL Media Insider Ian Rapoport reported Monday, per a source in contact with Kubiak.

"It is treatable, which seems to be the reason for the optimism when you talk to the Texans," Rapoport said Monday night on NFL Network's "NFL Total Access."

After he collapsed, Kubiak, 52, was taken to a local hospital and admitted overnight. He underwent what the Texans described Monday as a "battery of tests" and remained in the hospital.