Off contract Brisbane hooker James Segeyaro has been provisionally suspended by the NRL after testing positive to a banned substance.
The NRL confirmed on Thursday night that the PNG international had returned a positive A-sample for Ligandrol, a non-steroid anabolic agent popular with bodybuilders.
It is the same substance that has been found in Australian swimmer Shayna Jack, who faces a ban of up to four years.
The NRL said they were now awaiting the B-sample results after Segeyaro was tested by the Australian Sports Anti-Doping Authority on September 3 and alerted of the findings on Thursday afternoon.
"The provisional suspension notice asserts that Mr Segeyaro returned a positive A-sample for di-hydroxy LGD-4033 (Ligandrol) which is prohibited by the World Anti-Doping Agency and the NRL's anti-doping policy," an NRL statement said.
"Mr Segeyaro is prohibited from participating in any WADA compliant sport, including rugby league, while the provisional suspension is in place.
"Under the Anti-Doping Policy, Mr Segeyaro now has the opportunity to have his B-sample analysed.
"The NRL has spoken with Mr Segeyaro and advised him of support services.
"The NRL will not be making further comment while the ASADA investigation is underway."
The Broncos said on Thursday night they were still trying to get in contact with Segeyaro who is overseas on an end of season holiday.
"The Broncos have been working closely with the NRL since being alerted to the positive test early this evening," a Broncos statement said.
"With athletes unable to participate in any WADA-compliant sport while an investigation of this kind is underway, the player has been immediately stood down.
"Under due process through the anti-doping policy, the player now has the opportunity to have his B sample tested.
"As this matter is currently an active investigation, the Broncos are unable to make any further comment.”
Segeyaro’s career in jeopardy
Segeyaro - a nine season NRL veteran - will remain sidelined as he sweats on his future.
He looks set to miss this month's World Cup Nines after being named in PNG's squad this week.
The A-sample results came the same day reports emerged salary cap pressures looked set to squeeze Segeyaro out of Brisbane next year.
Former Penrith, North Queensland and Cronulla rake Segeyaro had only arrived at Red Hill this year.
Jack, 20, blamed a contaminated substance and has vowed to clear her name after being kicked off the 2019 world titles swimming team in July for testing positive to Ligandrol, which increases muscle mass.