Mason started training with the club again in May past year but no expected return date was ever given and then Tigers boss Leonid Slutsky said in August that "the question is not just about football but about his life" when the player went to see a third specialist.
"I've sought about ten specialists' advice, but the risk was too high".
After undergoing a successful operation, Mason spent the past year rehabilitating in an attempt to return to professional football.
Following his injury, Mason's Hull team-mates displayed their support by wearing shirts with his name and squad number on the back before a League Cup semi-final clash with Manchester United.
"Of course the door is open to help him; myself, the coaching staff and the club, because we love him and all his family".
Absolute class from Pochettino and Spurs.
"It was hard from the beginning for him to cope with the training sessions, they're very tough". After only a few training sessions, he understood everything, [including] what another player needs a year to understand - the tactics, the movement, the concepts.
"I am so proud to have come through the ranks to play for my club, the club I love", he said. Wish you all the best in your future endeavours!
"In the first game we played against Seattle, he understood everything", Pochettino recalled. '(The doctor) said there was a moment shortly after I arrived at the hospital, I think maybe just after I'd had a CT scan, that I was what they call "unresponsive".
'The doc, to be fair to him, had waited for the right moment to talk me through the accident and the operation. I don't know if he'll end up going into management, but I can't think of a better place to hone his coaching skills than at Spurs. He is 26 but he is an unbelievable person and has an awesome football brain, ' said the Tottenham manager.