The front rower suffered a knee injury in the side's opening match at the Auckland Nines.
He was ruled out of the remainder of the tournament by Roosters Medical Staff following the injury and underwent surgery after returning to Sydney.
It is expected that Isaac's recovery will take 4-6 weeks.
After fracturing his right fibula in the opening minutes of the 2013 Rugby League World Cup Final, RTS has been kept on limited duties throughout the Off-Season and only returned to training in Week 1 of the 2014 schedule.
RTS last weekend returned to the field for the first time since the RLWC decider, for the Newtown Jets, against Penrith Panthers and came through the first 40 minutes unscathed.
Roger is now available for selection in Round 1.
After tearing his ACL in his return from injury, in the Round 15 Holden Cup fixture against the Bulldogs at ANZ Stadium, Tautau underwent a second knee reconstruction in as many seasons.
On a limited working load since suffering the injury, Tautau has responded well to treatment and has returned to running and light training.
It is still expected that he will make a return to play mid-season.
Tickets are still available for our Round 1 clash with the Rabbitohs at the scene of last season's Minor Premiership and Premiership wins, ANZ Stadium.
It might not be our home game but the boys still need Your support as we look to kick off the new year with a win against our arch-rivals. [CLICK HERE] to purchase Tickets.