Leinster's Isa Nacewa admits that the IRFU foreign player proposals could see him leave Ireland.
Ther IRFU have brought in a new rule that means that those five foreign players each province are allowed to play (plus one who can become Irish qualified through residency) are being reduced to four plus one from next season onwards.
Moreover, the IRFU's Professional Contracts Review Group have decreed that no foreign players' contracts can be renewed.
There is talk that the regulation, which are stricter than for any of the Irish teams' European rivals, could be reviewed, but Nacewa told Setanta Sports' iTalkSport programme that he was preparing himself for the worst.
"It is definitely something I don't want to do (leave Leinster)," he said.
"I've got a young family here that were born in Dublin and have grown up in Ireland. We hope the rules get down a bit but at the end of the day if I'm forced to leave it's just something I'll have to deal with.
"It's a bit up in the air at the moment. I think they've (IRFU) let their guard down a bit. "But at the end of the day they're rules and if they decide to employ them, I think it will change a lot of the structure of some of the teams out there."
It would be a wrench for Nacewa to depart, as he particularly values the contribution that Leinster coach Joe Schmidt has made to his career.
"His presence and what he expects from players, he's brought out the best in everyone there. In our Monday review sessions, there's just absolutely no hiding," he said.
"You can't be lazy and you can't be hiding on the pitch because he'll pick it out and he'll put it up there for everyone to see.
"I think he's created an environment where you don't want to be slacking off during a match because it'll be up there on a Monday morning and it's got the best out of all of us."