Soliola has missed just one game this year of the Saints' 19 Super League and cup matches and sustained the injury a week ago Friday playing for the Exiles in the 30-10 defeat by England.
St. Helens is on the bottom half of the Super League table after losing half of their first 18 fixtures and is upset about losing the New Zealander after failing to capture the imagination of rugby fans.
"It's disappointing to lose Sia, who has to have an operation, Saints coach Nathan Brown said. "The upside is that it gives another player the chance to step up and stake a claim for a place."
"Our squad as a whole has gained vital experience throughout the course of the year and I have no doubt we will adapt and continue to develop," Brown added.
The 26 year old popular Kiwi joined the Saints from the Sydney Roosters and has been a regular in Brown's side this season.
Joe Greenwood played for the squad on Friday at Salford as Soliola's replacement and prop Anthony Laffranchi returned from injury.
Reference: St. Helens Reporter
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