According to the stuff.co.nz website, five weeks after the dual international was finally unveiled as the club's biggest recruit in years, Williams' one-year contract is yet to be officially registered by the NRL's salary cap auditor Ian Schubert.
The 27-year-old is expected at training with the Roosters in just over 50 days after he finishes his rugby union commitments in Japan and fights South African Francois Botha in a heavyweight boxing bout.
But Roosters fans might be feeling a bit jittery that the strapping New Zealander's $550 000 deal hasn't been ratified, potentially jeopardising an emotion-charged return to rugby league after walking out on the Bulldogs in 2008.
Folau walked away from a return to the NRL with Parramatta earlier this month, opting for a switch to rugby union with the Waratahs as he "couldn't wait any longer sitting around" for his contract to be sorted out.
However, Sydney Roosters chief operating officer Brian Canavan isn't fretting over the time taken to get Williams' deal ticked off and still hopes for a resolution over the next week.
"We're just exchanging correspondence back and forth (with the NRL)," said Canavan on Tuesday.
"It's just the process that happens with these more extended contracts.
"The sooner the better. It would be lovely before Christmas."