Bulldogs rugby league superstar Sonny Bill Williams is reportedly en route to France to play rugby union.
Bulldogs CEO Todd Greenburg told ABC radio that Williams' manager Khoder Nasser had confirmed the star player's sudden departure.
"I've just got off the phone to Sonny's manager Khoder Nasser and he has confirmed to me that Sonny has left the country," Greenburg said.
"Quite simply, if Sonny intends to play overseas, we'll be looking to take out an injunction which will effectively stop him playing in France, England or anywhere else he intends to do it."
Asked whether the issue was likely to end up in the courts, Greenburg said: "I suggest at this early stage that you are probably right but we are going to have to review all our options to make sure that the Bulldogs are well covered."
Channel Nine reported that Williams walked out on his five-year deal with the Bulldogs to fly to France where he is to sign a deal with second division rugby union club Toulon - where former Wallabies captain George Gregan has been playing.
The deal is reportedly worth $A3 ($NZ3.91) million over two years.
Williams had been signed to the Bulldogs until 2012 for an estimated $A450,000 a year.
But the New Zealand international had been at loggerheads with the club for some time, claiming he was worth more money.
He was also upset with what he perceived as excessive media scrutiny into his private life and at the urging of the club having to admit he had problems with alcohol last year.
His departure comes after St George Illawarra centre Mark Gasnier also signed a deal with Stade Francais worth an estimated $A2 million over two years.
