Parramatta coach Ricky Stuart says the club is "punching its head against a brick wall" in negotiations with the NRL over Israel Folau and warns the game risks missing out on the superstar if decisions aren't made quickly.

After Folau announced at the start of the month he was leaving the AFL, Stuart said the former Test and Queensland Origin back remained anxious to sign with the Eels, but that red tape was still getting in the way.

The NRL must give the green light to Folau's return to the code before any contract can be ratified, just like rugby convert Sonny Bill Williams' Sydney Roosters deal is yet to be rubber stamped by officials at Rugby League Central.

Stuart said the saga has dragged on to the point where he can no longer be directly involved and he's leaving negotiations to club chief executive Ken Edwards.

"I said early in the piece that we'll move heaven and earth to get Izzy to the club because that's where he wants to play. He's come out and said that, he's from here, he's got a number of close mates here, but we're doing that and it's been a long time so I really don't know where it's going to end up," said Stuart on Wednesday.