On 2 November 2019, Vermeulen played in the 2019 Rugby World Cup Final against England. He was part of the South African team that won their third World Cup at the Yokohama Stadium in Japan. He was awarded a man of the match award for his performance where he made a number of vital contributions, including 10 carries, making 49 meters (both the most in the match) and 2 turnovers.