The last time Cardiff and Southampton played in the EFL Cup was in the 2018-2019 season, with Southampton winning 0-1.
Cardiff City's home ground is the Cardiff City Stadium, while Southampton's home ground is St. Mary's Stadium.
Both Cardiff and Southampton have a long history of competing in English football leagues, with Cardiff being established in 1899 and Southampton in 1885.
Cardiff City's nickname is the Bluebirds, while Southampton's nickname is the Saints.
Cardiff City currently competes in the EFL Championship, while Southampton competes in the Premier League.