The North Harbour prop made his Super Rugby debut for the Blues against the Crusaders in 2015. In 2021 he made his Gallagher Chiefs debut v Highlanders and has since had 9 appearances.

Mafileo attended Wesley college and excelled in Rugby playing the role of a bust-out prop with excellent speed & acceleration. He later attended Saint Kentigern College in Auckland and won the Auckland schools competition with them in 2012.

Mafileo was a New Zealand Schoolboys representative in 2011 and was a member of the New Zealand Under 20 which competed in the 2013 IRB Junior World Championship in France where he made 5 appearances.

Sione Mafileo