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          NFL Nation

          Donald Thomas to have MRI on quad

          • Mike Wells, ESPN Staff WriterJul 30, 2014, 05:45 PM ET
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            • Previously worked at Indianapolis Star, covering the Indiana Pacers for nine seasons
            • Also covered Vikings for St. Paul Pioneer Press
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          ANDERSON, Ind. – The Indianapolis Colts have already lost running back Vick Ballard (Achilles) for the season.

          The team now must worry about guard Donald Thomas.

          Thomas limped off the practice field Wednesday after it’s believed that he re-injured the same right quad that kept him out of all but two games in 2013, according to a person with knowledge of the situation. Thomas was clearly upset after he got up off the ground and made his way off the field. He’s expected to undergo an MRI on Wednesday evening.

          The Colts can’t afford to lose Thomas for an extended period of time because not only is he projected to start at left guard, he’s also the team’s primary backup center.

          Rookie Jack Mewhort, Lance Louis and Joe Reitz are guards on the Colts' roster.