But Long turned the contract down stating that the length of it was too short, and Saints told him he could approach other clubs should he wish to.
Hull have taken advantage of that factor, and a delighted Head Coach, Richard Agar, believes that the acquisition of Long is a “big signing” for the club.
“Sean is a big name in the game and a big signing for us,” said Agar.
“I think this will be very important for the club in the way we are looking to move forward.
“We have also done well to have beaten off a number of other clubs.”
Long believes the move will help “revitalise” his career after several years at the Saints, winning every honour.
“This move is absolutely fabulous. It has been quite a hectic last couple of days but now everything is sorted I am really buzzing and looking forward to joining Hull,” he said.
“A few clubs contacted me and offered two year deals but when Hull made an approach and after I had spoken to Richard Agar I knew where my future was.
“I have to say one of the main reasons I agreed to the deal was after speaking to Rich. He explained where he wanted to go and where I would fit into those plans and what sort of job he would be looking for me to do in those plans.
“It really excites me and I really believe it is going to revitalise my career.”