According to reports in the French press, Sale prop Eifion Lewis-Roberts could be suspended for up to two years after returning a positive drugs test following the Top 14 Final.
Lewis-Roberts, then with Toulon, returned a positive B sample for morphine and pseudoephedrine after the final against Toulouse in June, with both drugs discovered following a urine test according to L'Equipe.
It means that Lewis-Roberts could receive a punishment ranging from a warning to up to two-years suspension, unless he can prove that the drug did not enhance his performance.
The news comes as a surprise given that the B sample was tested seven months after the game took place.
Toulon flanker Steffon Armitage was charged with a similar offence after testing positive for morphine, which is metabolised from codeine, except Armitage admitting to taking the drugs on his dope test form.
Armitage was cleared of doping charges after insisting his failed test was as a result of taking two anti-inflammatory tablets before the game to combat back pain.