Hull coach Brett Hodgson said: “Keeping Josh for another two years was an easy decision – you saw the strength he brings us when he hasn’t played this year, because we’ve really missed his influence.
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“He’s grown into one of our leaders and is vocal amongst the players every day. He is one of the best centres in the competition and an important part of our team.”
Josh Griffin said: “It was a really easy decision for me to stay here. I love being here in Hull and at the club.
“Me and my family have settled down nicely in the five years we have been here and to be staying here for at least another two years is fantastic.
“All my focus is on returning to action next year and playing my part in helping the team return to the levels we know it should be at – that’s challenging for trophies.”