Rumball attended Queens University and was the captain for the Gaels Rugby team, he represented Canada at Under-18s and the Under-20s and captained the later in the World Rugby Trophy competition in 2015.
Lucas played club rugby with Balmy Beach RFC until be became part of Canada’s Centralized Player’s Squad. He moved to British Columbia and joined the James Bay Athletic Association.
He played Provincial rugby for the Ontario Blues and has participated in numerous Canadian Rugby Championships. He played for the Blues against the USA Collegiate All-Americans in 2014 and against the ARP All-Stars in 2015.
Lucas made his debut for Canada’s Senior Men’s National Team in 2016 against Uruguay at Langford on February 6, 2016, at the Americas Rugby Championship.
He debuted as the captain of the Senior Men against Russia in June 2018.
He played for Canada against Oxford University and against Coventry in England prior to leaving for France for World Rugby Repechage matches against Kenya, Germany, and Hong Kong.
He signed for the Toronto Arrows ahead of the 2019 Major League Rugby season.
Ahead of the 2019 Pacific Nations Cup he has 29 test caps, 26 of which in the starting line up scoring 4 tries.
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