In 1998, London became a charter member for the Canadian Professional Soccer League. In the initial stages of the new league City managed to compete several times for a postseason berth. Shortly after the club went through a difficult rebuilding stage as a result missed the playoffs for twelve consecutive seasons. Their biggest success came in 2003 when they captured the Open Canada Cup. After the loss of Harry Gauss to cancer and the higher playing standards placed by the league the Gauss family decided to sell the club. The new ownership of Andrew Crowe and Zoran Kliseric brought an end to London's postseason drought and qualified for the playoffs in 2013. After four years of ownership both Crowe and Kliseric sold their shares ultimately to former general manager Jasmin Halkic who relegated the club to the Second Division in 2016 in order to serve as a reserve team for Milton SC.