Tusi Pisi

Pisi played in both the 2011 and 2015 tournament and is still playing professionally in Japan. He played with two of his brothers Ken and George at the last World Cup in England.

Alaalatoa's father Vili was in the first Samoa side to play at the World Cup in 1991, while his younger brother Allan has been named in the Australian squad for the tournament.

Michael made his first appearance for the side in a match against a New Zealand Heartland XV on Saturday and could potentially face Allan next week in Sydney when Samoa play the Wallabies.

The 33-year-old fly-half, who is the brother of Northampton Saints duo Ken and George Pisi, has 28 caps for Samoa.

He will join the Championship leaders from Japan's first Super Rugby franchise Sunwolves, founded in 2015.

The 33 year old was heavily involved in the Sunwolves 26-13 defeat to the Lions in Tokyo two weeks ago, scoring the Sunwolves first competition points and receiving their first yellow card.