In late 1998 Finau signed for Welsh rugby union side Llanelli Scarlets under coach Gareth Jenkins. Finau made 203 appearances for the side over the next six-year, becoming an instrumental team player, playing in 3 European Cup semi-finals and 2 Celtic League Titles, before ending his contract by mutual consent in September 2005. He then signed for Bath Rugby under John Connolly, spending a season at the West Country club before moving to French side Bourgoin. Finau had a successful season at Bourgoin, and on completion announced that he had signed a 2-year contract for Cornish Pirates. However, in June 2007, the club announced that they had agreed to release Finau from the deal when a family illness obliged him to return to his native Tonga.