Career
A Tonga national representative second-row forward, he previously played in the National Rugby League for Australian clubs the Wests Tigers, South Sydney Rabbitohs, Saint George Illawarra Dragons and the Sydney Roosters. In August 2008, Willie Manu was named in the Tonga training squad for the 2008 Rugby League World Cup, and in October 2008 he was named in the final 24-man Tonga squad. He played for Tonga in 2009 in a Test match against the New Zealand Kiwis.
Saint Helens reached the 2014 Super League Grand Final and Manu was selected to play from the interchange bench in their 14-6 victory over Wigan Warriors.