English Super League club Wigan has denied it is chasing Bulldogs sensation Sonny Bill Williams.

Weekend reports claimed Wigan was trying to lure the teenaged second-rower with a STG900,000 ($A2.15 million) three-year offer as it looks to replace captain Andy Farrell, who is expected to switch to rugby union.

"I can categorically say that is untrue," Wigan chairman Maurice Lindsay said.

"We wouldn't offer anybody that money anyway. The English salary cap doesn't allow that. Nobody would do that, that would be madness.

"The salary cap's STG1.7 million ($A4.06 million), if you pay one player that sort of money, that's nearly 20 per cent gone already."

After Williams' manager Chris Orr claimed last week an English club had made an offer that "blew us away", the Bulldogs immediately improved their offer for the New Zealand international, who is off contract at the end of this season.

But Lindsay denied Wigan had approached Williams, even though some rival clubs reportedly claim a deal had been done.

"It's all speculation following the Andy Farrell story," Lindsay said.

"Andy Farrell has not gone yet, he might still be playing with us so we're not trying to replace Andy at this stage.

"Only if and when Andrew decides to go to rugby union, which is not yet solid, will we start to consider the squad for next year.

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