Toulon owner Mourad Boudjellal has threatened to sue Leicester Tigers supporters who provided evidence which led to Delon Armitage's 12-week ban.
The 31-year-old was handed the hefty sentence for verbally abusing fans following a European Champions Cup tie at Welford Road earlier this month.
"It's incomprehensible. This is an extraordinary decision which rests only on the allegations of two opposition supporters, whose objectivity we can legitimately put in doubt," Boudjellal is quoted as saying by the Daily Mail.
"There is no formal proof, no official document, not even television pictures to attest to the veracity of these testimonies. We aren't discounting the eventuality of going after these two supporters in court for false testimonies."
An additional four weeks were added on top of the original ban as it was Armitage's second post-match misconduct charge in the last four years.