The Excelsiors play in the OLA Junior B Lacrosse League and are eligible to compete for the Founders Cup National Championship.

Announced October 16, 2011, the Excelsiors were admitted as an expansion team into the OJBLL for the 2012 season.

[1][2] On April 22, 2012, the Jr. B Excelsiors played their first game, at home, with an 11–6 win over the Hamilton Bengals.

[4] In their second season, the Excelsiors finished 10–10 and received the final playoff spot in their conference.

[5] The 2014 season was filled with a summer-long battle against the Welland Generals and Owen Sound North Stars for the final playoff spot in the West.