Hong Kong, South Korea and Malaysia shall compete in the 2019 series.

Other Asian nations played in the lower division tournaments.

The format of the tri-nations series is a double round-robin where the three teams play each other twice on a home and away basis.

The team finishing on top of the standings at the end of the series is declared the winner.

The teams involved, with their world rankings prior to the 2019 tournament in brackets:[1] Source: asiarugby.com[2]