HOUSTON -- Texans coach Gary Kubiak will remain in hospital until at least Tuesday after collapsing on the field at halftime of Houstons 27-24 loss to Indianapolis. The team said the 52-year-old Kubiak experienced "dizziness and a light-headed feeling" during Sunday nights 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 coachs health. "He is continuing to be evaluated and monitored." 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 hell return. "There was a lot of unknown," said defensive co-ordinator Wade Phillips, who coached the team after halftime. "Everything was unknown as to what was going on and what happened to Kube." 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 teams plays. The Texans were a trendy Super Bowl pick in the off-season and started 2-0, but the season had turned into a disaster even before Sunday night. "Its on your mind when youre 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 didnt want to blame the loss on what happened to Kubiak, who has never publicly disclosed any health problems. "I thought we dealt with it well," Reed said. "Weve just got to finish." Kubiaks 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. Fox had been told earlier about his heart condition and was hoping to put off the operation until February. On Saturday, Fox became dizzy playing golf near his off-season home in Charlotte and was taken to a hospital, where tests revealed he couldnt wait any longer. Kubiak made his mark as Denvers offensive co-ordinator under Mike Shanahan, winning two Super Bowls. An eighth-round pick out of Texas A&M, he spent nine years as John Elways backup. He finished his career 4-1 as a starter, all in emergency relief of Elway. 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. Smith spent 10 years with Kubiak while the coach was offensive co-ordinator of the Broncos. The pair has helped transform the Texans, which began play in 2002, from league laughingstock to contender. The team went 6-10 in their first year and 8-8 in each of the next two seasons. Expectations were high in 2010 after Houston finished at 9-7 for its first winning record in 2009. But the Texans instead fell to 6-10, which led to many fans calling for Kubiaks firing. 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. Last year, the Texans announced contract extensions for both Smith and Kubiak, rewarding them for taking the team to the playoffs last year for the first time. Kubiaks three-year agreement has him under contract through 2014. McNair said at the time he offered Kubiak a four-year deal, but the coach preferred to make it for three. 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According to the Star-Tribune, multiple people were wounded -- two seriously -- by an unknown gunman that fired several shots around 1:50 a.m. CT onn Saturday morning.dddddddddddd "The entire Vikings organization is extremely thankful that Linval was not seriously hurt, and our thoughts are with all of the victims of this shooting," the team said in a statement. "The team will defer any further comment to the Minneapolis Police Department during its ongoing investigation." Joseph signed a five-year, $31.5 million contract with the Vikings in March after spending four seasons with the New York Giants. The 25-year-old produced nine sacks while starting 46 games for New York over the last three seasons and was a member of the Giants Super Bowl XLVI champion team in 2011. 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