Sonny Bill Williams doesn’t know exactly what he’ll be doing in 2013 – but he won’t rule out linking with the South Sydney Rabbitohs.

After sweating his way through an hour-long sparring session in Redfern on Monday, Williams admitted that a return to the NRL was something he thought about from time to time.

The NRL will not register a Williams’ contract until after the 2012 season, due to the former star backrower walking out on a five-year deal while at the Bulldogs in 2008.

And, just like he does every year, when 2013 comes around Williams will reassess his options as new opportunities arise.

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Close friend and boxing mentor Anthony Mundine has ties to South Sydney and recently steered Australia and Queensland centre Greg Inglis to the club.

While Mundine admits he would enjoy seeing the rampaging Kiwi wearing the red and green he would never pressure Williams into joining the foundation club.