Percy Dermond was a rugby league

Rugby league

Rugby league football, usually called rugby league, is a full contact sport played by two teams of thirteen players on a rectangular grass field. One of the two codes of rugby football, it originated in England in 1895 by a split from Rugby Football Union over paying players...

 player in Australia's premier competition the New South Wales Rugby Football League (NSWRFL).

A Winger, Dermond played for the Eastern Suburbs

Sydney Roosters

The Sydney Roosters are an Australian professional rugby league football club based in the Eastern Suburbs of Sydney. The club competes in the National Rugby League and is one of the oldest and most successful clubs in Australian rugby league history, having won twelve New South Wales Rugby League...

 club in the years (1938-39), (1941-43) and (1946-47). In the 1941 Season Dermond, with a total of 13 tries for that year, was one, of three players, to be that seasons leading try scorer.

Dermond played in two premierships deciders for Eastern Suburbs club. However, they lost both matches. In 1938 they were defeated by Canterbury Bankstown

Canterbury Bulldogs

The Canterbury-Bankstown Bulldogs are an Australian professional rugby league football club based in Belmore, a suburb in the Canterbury-Bankstown region of Sydney. They compete in the National Rugby League premiership, as well as New South Wales Rugby League junior competitions...

 in their maiden premiership victory and in 1941 they were defeated by St George, it was also their first premiership victory.

The winger played a total of 51 matches for the club, scoring a total of 36 tries and is officially recognised as the clubs 259th player.