 Isaacs played just one more international game in the very next match of the Home Nations Championship against Scotland at St. Helens, his international career identical to that of Raymond Bark-Jones.At the start of the 1933/34 season Isaac left rugby union behind when he 'Went North' switching to the professional rugby league game, joining Leeds RLFC.Wales

Isaac won caps for Wales (RL) while at Leeds in 1933 against Australia, and 1935 against France.