The team says Kubiak became dizzy and light-headed Sunday night, causing him to stop and kneel down on his way off the sidelines. He was admitted to a hospital in the Medical Center.
After multiple tests and diagnostics, it was concluded Kubiak experienced a transient ischemic attack (TIA). He is expected to make a full recovery.
It has not been determined when Kubiak will return to Reliant Stadium to resume his head coaching duties.
Statement from Houston Texans Head Coach Gary Kubiak:
"I want to thank my family, the McNair family, the Texans organization, the doctors and staff at Houston Methodist and the entire Houston community for all the love and support we have received over the past three days. I've been through an ordeal and my focus now is to get back to good health. Doctors have told me I will make a full recovery but we have not determined when I will be cleared to return to the office. Again, thank you for the support and concern."
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The Associated Press contributed to this report.