Hooker James Segeyaro has committed his future to Leeds until the end of 2018 after deciding not to exercise an opt-out clause in his contract.
The Rhinos have won all seven matches since the former Penrith Panthers player joined them in July in an exchange deal that saw unsettled fullback Zak Hardaker gain his wish to play in the NRL.
While Hardaker looks poised to return to Super League following the expiry of his loan spell with the Panthers, the 25-year-old Segeyaro will see out the two-year deal he agreed on his arrival in Yorkshire.
Leeds chief executive Gary Hetherington confirmed the cut-off date for the opt-out clause, which applied both to player and club, has expired.
"It only applied if he didn't settle, which has never been an issue," Hetherington said.
"James has settled in well and he has made a big contribution to the team performance. He's a world-class talent and this is good news for Leeds Rhinos and Super League."
Segeyaro, who has scored five tries in his past five games, said: "I've really enjoyed my time so far in Leeds and I'm here to win trophies with the Rhinos and play in the big games."
Leeds, who suffered a remarkable fall from grace after completing the treble in 2015, will secure their Super League status with victory in their fifth Qualifiers match against Batley at Headingley on Friday night.
