In previous seasons , Warner had split time with the team 's younger quarterback Matt Leinart .
Warner started the final 11 games of the 2007 season after Matt 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 .