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Steelers RG David DeCastro suffered injuries to the ACL and MCL in his right knee, and "will be out for a while," according to a source who spoke with NFL Network Sunday morning.
DeCastro was injured on the team's second drive of its third preseason game, a 38-7 win over Buffalo.
Veteran Ramon Foster would likely start at right guard in what seems to be probable scenario DeCastro is lost for the season.
DeCastro, the team's first-round draft pick in 2011, was expected to be one of the top rookies in the league this season, en route to an outstanding career. Teamed with C Maurkice Pouncey, the interior of the Steelers offensive like was to be stabilized immediately, if not dominant, as the two became the centerpieces of a young offensive line.
It appears the Steelers will have to wait at least a season for that to begin. In the meantime, the Steelers prepare for their fourth preseason game vs. Carolina Thursday, with the season beginning Sept. 9 in Denver.