The Wildcats' new coach Richard Agar has wasted no time in bolstering his squad for the 2012 Super League campaign as he had already brought in 13 new faces before 22-year-old former Junior Kiwi, John, was snapped up.
And, the new arrivals will not end there as former Wigan and Cronulla stand-off Tim Smith is also expected to sign.
Agar said: "Isaac is a key signing for us. He is a very skilful and talented ball player with great footwork and a good kicking game."
He added: "A couple of untimely injuries and with the talent in front of him, it has been difficult for Isaac to get any sort of sustained run in the Warriors side.
"But having seen him star in the recent grand final for the Junior Warriors, there's no doubting the ability he has and I'm very happy that he'll have the chance to show the rugby league world that in a Wakefield Wildcats shirt.
"We have some really good quality across the board now and hopefully we can still add a couple more to the roster before too long."
John said: "I've had limited opportunities at the Warriors so the chance to come and run a team around the field is a big one for me."