Citing a source with knowledge of the situation, Profootballtalk.com reports that the Texans fear Matt Leinart fractured his left collarbone on a third-down play Sunday, knocking him from the game. He has returned to the sideline in a sling, all but confirming a significant injury. Leinart also fractured his left collarbone in early October of 2007 with the Cardinals, and it ended his season. The Texans will have to hit the quarterback market this week if Leinart's incurred the same injury. Fifth-round pick T.J. Yates has shown better arm velocity than Leinart against the Jaguars, but has been inconsistent. Either way, the Texans will remain the NFL's most run-heavy team during the season's stretch run.