Hull have exercised an option to extend the contract of Fijian winger Ratu Naulago until the end of 2020.
Naulago originally joined the club on trial after being scouted playing rugby union for the British Army, and did enough to earn a permanent contract.
He has gone on to score 10 tries in 13 appearances for the Airlie Birds, and was recently named their Player of the Month.
Coach Lee Radford said: “I’m over the moon that Ratu will be staying with us until at least another year because he’s been showing nothing but huge strides in the right direction.
“If you compare where he was at back in pre-season to the way he is performing now, there is a phenomenal difference. One of the most exciting things is that he can still keep improving.
“There aren’t many players in this modern day in age who are so easy to coach. But Ratu is a great listener and he’s fantastic at adapting to different scenarios, so he’s got a very exciting future ahead of him at this club.”