Bulldogs chief executive Todd Greenberg has shut the door on a return to the NRL club by runaway forward Sonny Bill Williams.

Williams is reportedly homesick at French rugby union outfit Toulon and upset at his treatment by millionaire club president Mourad Boudjellal.

"We've heard those rumours as well and it's not surprising at all for us that he's homesick," Greenberg told Sydney radio station 2KY.

"Sometimes he got homesick when he was living back here in Sydney."

Greenberg said speculation the Bulldogs could be interested in bringing Williams back to the club was wide of the mark.

"If you're asking me if we want him back, the answer's no," he said.

"We've had no contact from Sonny Bill or his manager.

"We've moved on and our suggestion is he do exactly the same.

"In my view this chapter's over, it's complete. Sonny made his choices some months ago, the reality of that is now he has to live with those choices."

Williams has been nursing a leg injury and his time on the sidelines has reportedly angered Boudjellal.

"I think there's some reality checks in that, it's welcome to the real world," Greenberg said.

"People expect a return on their investment and millionaires don't become millionaires by making stupid decisions. Millionaires like this guy in France don't give away money without expecting a return on the outlay.

"Some are more bullish than others and I'm sure this gentleman, by the sound of things, sounds a little bullish but my advice to Sonny would be put your head down and do your best. I'm sure he'll be a great rugby union player."

The former Kiwi international second-rower paid $750,000 compensation to the Bulldogs after walking out midway through the first year of a five-year deal in July, but the NRL has blackbanned him.

Meanwhile, Toulon coach Tana Umaga is also reportedly under pressure with speculation former Wallabies boss John Connolly could link with the club.

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