Australia captain Darren Lockyer has admitted he would like to play in Super League before he retires.
I just think the NRL is a mentally tougher competition than Super League
Australia captain Darren Lockyer
The 29-year-old, regarded as the best player in the world, has three years to run on his Brisbane Broncos contract.
"If the body still feels as good as it does now, then it's definitely an option," the stand-off told BBC Sport.
"A lot of Australian players have come to Super League towards the end of their career and it's one of those things where I'm curious about it."
Lockyer won the Golden Boot last year as the outstanding player in the international game, as well as collecting a clean sweep of trophies in the NRL, State of Origin and Tri-Nations.
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And he said the prospect of winning trophies in Super League would be a major attraction.
"It would be a new challenge and one that would be exciting to me as a player, but it's still three years away," he added.
Lockyer said the main difference between the two leagues was the psychological toughness of the players.
"I watch a fair bit of Super League, and it's a game that looks as fast as the NRL, if not quicker, perhaps because the play-the-ball is a bit quicker," he said.
"I think there's a lot of quality players in Super League, and we saw that when Great Britain came over for the Tri-Nations.
"But I think the NRL's main advantage is that every game, every week, is a really tough match.
"You just don't get weeks where you can have an easy game and relax so it hardens you up, physically and mentally.
"You have to front up every week and that's what the NRL is renowned for. With Super League, the top teams might get a few weeks when they have easier games.
"I just think the NRL is a mentally tougher competition. I certainly don't think there's any difference in the skill levels, it's just that we have to perform all the time - and the State of Origin are some of the toughest games you'll ever play in."