The 28-year old declined the opportunity of an extended break after his Four Nations exploits to team up with his new club ahead of schedule.
“Dale has come back early even though we offered him some time off following the internationals and that shows the type of attitude he has got and that is the level of work ethic and commitment we’re looking to have in this squad and I’m looking forward to seeing more of him in training,” Stone said.
“Dale was signed to the club a while back and so I was keen to see how he would do in the Four Nations and I was suitably impressed.
“He showed a lot of class and toughness against world class teams in that tournament, he has a good skills set, is tough and will compete hard which will bring plenty to our squad.”
Ferguson, who previously played for the Giants between 2011-13, making 59 appearances and scoring 15 tries, has signed a two-year deal with the club.
“It was tough to leave but at the time it was the right time but as soon as the opportunity arose to come back I jumped at the chance,” he said.
“Everyone wants to play Super League top level and I’ve spoken to Rick [Stone] and I like what he is about and what he wants from the club, that’s why I’m on board and I want the club to move in the right direction.
“I’ve been with both Ryan [Brierley] and Danny [Brough] at Scotland for the Four Nations and they are world class half-backs and they’ve proven it against the world’s best, so to play with them at club level is great and I’m looking forward to getting into pre-season now and joining up with the rest of the squad.”