Patrick made his Giants debut in 2009, against Castleford Tigers, and has gone on to make over 100 appearances for the club.
As a youngster, Patrick rose through the Bradford Bull academy before moving to Australian side Narrabeen Sharks. The 27-year old has represented Wales and appeared in the 2013 Rugby League World Cup for his country playing against USA, Cook Islands and Italy.
The forward could feature in Sunday’s home game v Hull KR.
“I’m delighted to be to such a passionate club who are now a formidable team who are pushing for silverware,” Patrick said.
“I’ll be doing my best to help the team achieve their goals this season.”
Tigers head coach Daryl Powell said: “In terms of injuries we have been belted a little bit over the past month and to get someone in like Larne gives us a few options. He’s a good player and he’s highly rated in the game. I like the way he plays and he’s a tough defender.”
Tigers CEO Steve Gill said he was pleased to conclude this loan signing with Patrick.
“We have been a bit low on troops in recent weeks, so for us it is a really good time,” he said.
“Although Larne will not be allowed to play against his parent club, we have agreed a ‘no call back’ clause with the Giants. I would like to thank all our fans who contribute to the “Tigers Daily Draw” for helping to make this possible as it’s their contributions that have helped us to be able to bring Larne in.”
Giants Managing Director Richard Thewlis said: “Clearly this is a loss to us and many will be sad to see Larne leave us but as we would have been unable to agree terms within our cap with him for a longer stay beyond this year we believe it in both parties best interests to make the move now.
“He has played over 100 games for us since we gave him his opportunity in Super League and he leaves with our very best wishes for his future.
“Hopefully from Larne’s perspective a fresh environment will re-vitalise him and get him back to his form of a few years back and for our part the freeing up of paid salary cap space will allow us to consider players who may become available.“