White, 23, played for Toulouse during their Championship campaign last season, before staying on to play in the French Elite League during the autumn and winter.
The Manly-born winger qualifies to play for France through his mother, and also holds English nationality, making him a potentially attractive proposition for Super League clubs who have already maximised their alloted quota spots.
Following the completion of the French season, he has now opted to leave Toulouse and put himself on the open market.
"Jason Robinson is one of my heros, a guy who came out and conquered adversity with the great footwork and other skill gifts he was given. Jason worked closely with my Australian S&C coach, Marty Hulme, in his days at Wigan and I’ve received lot’s of encouragement through his story and others. Stepping out into adversity to achieve great things is something that makes this sport and the people within it special – and I’m keen to lead the way for others as an example to achieve.
"So if someone will trial me, I’ll be on the first plane to England to prove what i can bring to the sport. They have nothing to lose, and I promise I have everything to give."
In 2011, he scored 14 tries in 24 appearances for Toulouse in their final season in the Championship, before they opted to return to play in the French domestic league.
We take a look at how Castleford are hoping to build on last season's success...
York City Knights have announced a new-look Board of Directors that will enable the club to realise its ambitions in 2015 and beyond.