Houston Texans defensive line coach Bill Kollar remained in a Chicago hospital overnight after a blood clot was discovered, according to the Houston Chronicle.

Kollar was experiencing shortness of breath before the Sunday night game and was taken to a local hospital where the blood clot was discovered. Because of the blood clot, Kollar was not allowed to fly in an airplane, so he had to stay behind rather than head home with the Texans.

Linebackers coach Reggie Herring helped to coach the defensive line in Kollar's absence.

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Terry McCormick covers the Titans for TitanInsider.com