In Whisenhunt 's first season , Warner had split time with the team 's younger quarterback Matt Leinart , although Warner started the final 11 games of the 2007 season after Leinart suffered a season-ending injury . In previous seasons , Warner had split time with the team 's younger quarterback Matt Leinart , although Warner started the final 11 games of the 2007 season after Leinart suffered a season-ending injury .