Havili has settled in well after joining from the Scarlets last year

The 29-year-old Tongan has impressed since joining the club in October and has scored six tries in 13 starts.

"We have top quality coaches and a superb team spirit here which is why it was an easy decision for me to make," said Havili.

"I am pleased to be part of a team that is really going places. The club and the fans have made me very welcome."