It was thought initially that Burgess would not need an operation, but the injury failed to heal as hoped.
The delay means that he is now struggling to be fit for the Rabbitohs season opener against the Roosters.
”I think I’m going to make it but we’ll just have to see how it goes,” he told the Sydney Morning Herald.
“Everything’s on track, but the first four weeks, it just felt like it was going really slow. I’m just not able to do much at the minute.”