Texans coach Gary Kubiak "alert, coherent and in good spirits" after collapsing during game against Colts HOUSTON Texans coach Gary Kubiak will remain hospitalized until at least Tuesday after collapsing on the field at halftime of Houston's 27-24 loss to Indianapolis. The team said the 52-year-old Kubiak experienced "dizziness and a light-headed feeling" during Sunday night's game before being taken by ambulance to a hospital. The Texans have not said what caused the problem, saying only that Kubiak has gone through a battery of tests and is with his family. "Gary is alert, coherent and in good spirits," general manager Rick Smith said Monday as questions swirled about the coach's health. He is continuing to be evaluated and monitored. ESPN's Adam Schefter, citing medical sources, reported that Kubiak was treated at the hospital with medicine that's "designed to break up clots consistent with people who suffer strokes." Kubiak will remain at the hospital for at least the next 24 hours, the team said, leaving the reeling Texans, losers of six straight, left to wonder when he'll return. Kubiak hunched over and dropped to his knees at the 24-yard line and he was immediately surrounded by medical personnel. He was taken off the field on a stretcher and put in an ambulance. Kubiak has been head coach in Houston since 2006, a former NFL quarterback who calls the team's plays. The Texans were a trendy Super Bowl pick in the offseason and started 2-0, but the season had turned into a disaster even before Sunday night. "It's on your mind when you're out there playing," receiver Andre Johnson said. But you try to focus on the game and just go out and do your job. Up 21-3 when Kubiak collapsed, the Texans struggled after halftime as the Colts rallied for a win. Veteran safety Ed Reed didn't want to blame the loss on what happened to Kubiak, who has never publically disclosed any health problems. Kubiak's collapse came a day after Denver Broncos coach John Fox was hospitalized in North Carolina as he awaits aortic valve replacement surgery. The 58-year-old Fox will have surgery and miss several weeks while recuperating. On Saturday, Fox became dizzy playing golf near his offseason home in Charlotte and was taken to a hospital, where tests revealed he couldn't wait any longer. Kubiak made his mark as Denver's offensive coordinator under Mike Shanahan, winning two Super Bowls. Kubiak has long been known as a top offensive coach, mentoring quarterbacks in Denver and now Matt Schaub - and Case Keenum - in Houston. Kubiak was hired in 2006, along with Smith, after the Texans finished a franchise-worst 2-14. His original contract was due to expire after the 2010 season, but owner Bob McNair has stepped up to keep Kubiak and defend him several times amid the bumps. "Our primary concern is of course with Gary's health and well-being," Smith said. There have been so many people throughout the city and across the country that have reached out to express their love and support, and we are thankful for everyone's thoughts and prayers