Montgomery Biscuits
McGee made his minor league debut in , and spent 2004 and with the Princeton Devil Rays and the Hudson Valley Renegades. In , McGee spent the year with the Southwest Michigan Devil Rays. He played with both the Vero Beach Devil Rays and the Montgomery Biscuits in . he spent the entire with the Montgomery Biscuits, going 6–4 with 3.94 ERA. McGee was rated by "Baseball America" as the third-best organizational prospect for Tampa Bay Rays and 15th overall MLB prospect in 2008. In 2007, he was ranked 5th in the Rays' organization and 37th overall in all of baseball.