Speaking after Tonga's 22-16 victory over the Cook Islands, Murdoch-Masila was upbeat about his chances of playing in the tournament.
"The doc told me 2-4 weeks," said Murdoch-Masila.
"I've been working hard with the physio. He thinks I might be back for the next game against Italy."
Murdoch-Masila wasn't getting ahead of himself, despite his positivity, saying he wouldn't risk coming back a match early.
"We're pushing it to make it," said Murdoch-Masila. "If we're not quite ready, I'll rest it."
The explosive forward laughed off rumours he had done a more serious injury, saying he was shocked to read reports he would miss months with the injury.
"It's all good," said Murdoch-Masila. "I heard that everyone said I'd broken my leg or something!"
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