Interim NRL chief executive Shane Mattiske says he needs to see a contract in his hands before determining whether or not Sonny Bill Williams will be cleared for a return to the game.
Speculation mounted on the weekend that the NRL are considering blocking Williams' widely-discussed return to rugby league with the Sydney Roosters due to the fact the dual international is managed by non-accredited player agent Khoder Nasser.
Mattiske said no decision had been made on Williams - who walked out on Canterbury-Bankstown Bulldogs mid-contract in 2008 to take up a big-money offer in rugby union - simply because they had not yet been approached by the Roosters.
"The Roosters understand that if they are to bring Sonny Bill to the game, they need to come and approach us about that," Mattiske said.
"They need to get to a point where they've got a contract they can bring to us for registration - at this stage we're waiting for that to happen."