Racing 92 could take legal action against Johan Goosen after announcing that the South Africa international has claimed to have retired from rugby union at the age of 24.
The Top 14 champions appear unconvinced by Goosen's apparent 'retirement', which follows reports that last year's player of the season in the French top-flight was seeking a return to his homeland.
On Friday, Racing chairman Jacky Lorenzetti issued a statement via the club website, titled 'Johan Goosen announces he stops his career, should we believe?'
Lorenzetti's statement suggested Goosen was merely pretending to retire in order to get out of a contract that was only renegotiated in April.
It read: "Like certain media outlets have reported, Johan Goosen, who was voted best player of the Top 14 last season while wearing the jersey of Racing 92, has not been fulfilling his contractual obligations toward the club he is contracted to for the past few weeks.
"I would never have disclosed such info spontaneously, but it seemed essential for the future of our sport to clarify matters with the info that is already out there.
"Johan Goosen's contract was renegotiated under a year ago and now he pretends to get out of this contract in a remarkable way. He announced today that he has made the unbelievable decision to end his career and return to South Africa in favour of a career as commercial director.
"We obviously regret that such a young and talented player has made the decision to leave professional rugby because it seems impossible to combine his new role with a sporting career at the highest level.
"We would like to add that Racing 92 has always supported Johan Goosen both morally and financially. And even though he has recently lacked a certain respect toward his partners, coach and the members of his club and their fans, we hope that he will soon realise that a contract like that is the foundation of all professional and human relations.
"Of course, Racing 92 reserves the right to follow up such behaviour with all the appropriate legal measurements toward Johan Goosen and his advisors."