According to Jimmy Smith, the Roosters have enough room in their salary cap to fit Williams in following the conclusion of the Super Rugby and his commitments to the Auckland Blues.
The Roosters would need to register the contract with the NRL before June 30 to have Williams eligible to play but the deal is all but done according to Smith.
"They (the @sydneyroosters) would have to register the contract before June 30" notes @ThatJimmySmith re SBW's @nrl return. "He has been told be New Zealand Rugby he is not in their plans for the 2019 World Cup"
— BigSportsWend (@BigSportsWend) February 24, 2018
“Sonny Bill Williams will be turning out for the Roosters in season 2018,” stated Smith speaking on the Big Sports Breakfast weekend show.
“The mail is good. From what I understand the deal is done.
“It will be a short stint at the end of the Super Rugby season.
“They (the Roosters) would have to register the contract before June 30. They have space in the cap.”
The Roosters are already short-priced favourites to take out the 2018 Premiership after signing Cooper Cronk and James Tedesco. Adding a player of Williams calibre to the side could be the final piece to push them all the way to the end of September.