St George Illawarra hooker Siliva Havili ruptured his pectoral in Illawarra's Intrust Super Premiership win over Newtown last Saturday afternoon.

It was confirmed earlier in the week following an MRI scan that Havili will be out for the next four months.

Havili has surgery on Tuesday to reattach the pectoral, and will rely on the Dragons and Illawarra making a run deep into the finals to play again this season.