Case Keenum signed as an undrafted free agent with the Houston Texans. Keenum set several NCAA, conference and school records and left Houston as the all-time Football Bowl Subdivision leader in passing yards (19,217) and touchdown passes (155). The Texans put Keenum through a workout at Reliant Stadium and came away impressed. They'll enter the season with Matt Schaub as their starter, but the Texans won't devalue depth at the position after going through three starters in a span of three quarters at one point in 2011. Schaub (foot), Matt Leinart (collarbone) and rookie T.J. Yates all started for the AFC South champions. Leinart is a free agent not expected to return. That could make Keenum the Texans third-stringer behind Schaub and Yates.