[1][2][3] He replaced former captain, Fazil Marija as the new skipper of the Sri Lankan rugby union team in 2015.
[4] He played schoolboy rugby at S. Thomas' College, Mount Lavinia between 2009-2010 as a flanker.
He currently plays for Colombo Hockey and Football Club in the Dialog Rugby League.
In 2018, he became the first Sri Lankan to be selected to play at the Top-level Provincial Rugby tournament in New Zealand representing Auckland.
[5][6] Muthuthanthri was named to Sri Lanka's 2018 Commonwealth Games team in March 2018.