Harlequins back row Maurie Fa'asavalu has agreed a new two-year deal until the end of the 2013/4 season.
The 31-year-old Samoan, who is currently on World Cup duty in New Zealand, joined the London club from rugby league side St Helens last term.
He made 19 appearances last season, including the Challenge Cup final win against Stade Francais in May.
"It's great to be part of a squad that's growing and where everyone works hard to achieve our goals," he said.
"My family has really settled in down here and we enjoy the lifestyle, and the welcoming and inclusive nature of Harlequins makes it a great all round."
Harlequins have enjoyed a perfect start to the new Premiership campaign with three wins from three.
They sit at the top of the table and are the only side unbeaten.
Director of rugby Conor O'Shea said: "Maurie has made a huge impact on players and supporters alike and his example as a professional in everything he does is one which all young players should follow.
"He is a delight to have around. There is no doubt he brings something different and will help us develop further as a group. We look forward to having him back after the Rugby World Cup."