When an Australian sports promoter named Jason Moore gazes across the vast and increasingly varied American sports landscape, he sees room to grow for yet another international sport: rugby league.

With tens of thousands of rugby players already active in youth and amateur leagues across the country, the United States has the potential to produce tens of thousands more — not to mention prospective ticket buyers and television viewers.

Rugby is the fastest-growing team sport in the United States, according to the Sports & Fitness Industry Association, a national trade group. According to figures supplied by U.S.A. Rugby — the national governing body for rugby union, rugby league’s cousin — the number of youth participants doubled between 2010 and 2015.

There is also talent already available from another sport: About half of the United States team for this year’s Olympics once played football.