Aldridge was selected in the fourth round of the 1963 NFL draft, 54th overall, by the two-time defending NFL champion Green Bay Packers. One of the few rookies to start for head coach Vince Lombardi, he enjoyed an 11-year NFL career. As a Packer, he played a role in their unprecedented three straight NFL Championships (1965-66-67) and victories in Super Bowls I and II. Traded to the San Diego Chargers, Aldridge played two seasons in San Diego before retiring from professional football in 1973.