The 29-year-old former Warrington and Salford half-back joined the Tigers on loan in August after the Wolfpack pulled out of Super League and, following their failure to gain re-admission, has moved to secure his future.
O’Brien, who scored three tries from full-back in his eight appearances in 2020, will be vying with new signing Niall Evalds for the number one jersey and will also provide competition for the half-back spots in Daryl Powell’s squad.
“I think Gaz showed what an experienced half can add, either playing at half or full-back,” Powell said. “He’s pretty flexible and he has been great for us.
“We’re delighted he has taken up the offer to stay with us. It’s been tough for all the Toronto players not really knowing where their future lies and so there was a bit of flexibility there for Gaz.
“He’s fitted in well and so we were happy to give him some security if Toronto did not work out for him.”
— Gob (@gazobrien22) November 15, 2020
O’Brien said: “I’m very grateful for the opportunity to continue my stay at the Tigers and I’m really looking forward to the next three years.
“Since joining it’s been great. I settled in really quickly, the boys have been great and the coaches have been fantastic.
“It’s been a difficult year for everyone and I think we’re a bit glad to see the back of it and we’re all looking forward to 2021.”
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