The 2019 Rugby World Cup was an international rugby union tournament which was held in Japan from 20 September until 2 November 2019. Twenty national teams competed, and each brought a 31-man squad containing no regulated number of players per-position to the tournament. The tournament was administered by World Rugby, to whom each team submitted their finalised squad by 8 September 2019. A player may be replaced for medical or compassionate reasons, but would be unable to return to the squad. Any replacement player has an enforced stand-down period of 48 hours before they can take the field.