After several notable achievements at the amateur level, the organization joined the National Soccer League (NSL) in 1984.

After competing in the NSL for five seasons they returned to the amateur level by joining the Western Ontario Soccer League.

[3] The club would ordinally play in the London and District League, and in 1965 reached the finals of the Ontario Cup, but were defeated by Oshawa Italia.

[12] The following season Marconi reached the NSL league cup final but was defeated in a series of matches by Toronto Blizzard.

[18] The Ontario Cup victory qualified London for the 2014 Challenge Trophy, and under head coach Tyler Hemming the club secured their first national title after defeating Calgary Callies.