JOHN FURY said his son Tyson's life was "crumbling by the second" during his brief boxing retirement.
Unbeaten Fury claimed he was hanging up his gloves after knocking out Dillian Whyte at Wembley in April.
But John revealed it took just a month until his son began to feel the affects of not having boxing in his life.
He told the Daily Mail: "Tyson has been in and out of retirement since he turned pro.
"Aged 15, years ago. He will fall out with boxing for a week and then he loves it again.
"He loves boxing. Tyson has got nothing else without boxing. He loves the game so much.
"He said to me, 'I was retired for four weeks and my life has fallen to pieces. I can feel my life crumbling'.
"He said, 'My life was crumbling by the second'. He said he kept walking into the gym and smelling the gloves.
"Smelling the sweat and looking through the window thinking I want to get back in the game.
"He said he realised he was not done yet and not by a long chalk. So I said to him, 'Son if you feel like that, keep going until you don't feel like it anymore'."
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Fury first reigned as heavyweight king in 2015 after upsetting Wladimir Klitschko in Germany.
But he fell into depression and battled substance abuse, which led to almost three years out of the ring.
It sparked one of sport's greatest comeback stories, as Fury lost TEN STONE to return in 2018 and win the heavyweight title again two years later.
Fury still holds the WBC belt and is seemingly out of retirement again as he continues talks to face Anthony Joshua, 32, on December 3.
And dad John insisted his son will be back in the shape of his life.
He said: "At the minute, you've got the best Tyson. He's in the pump of his life. I think he just wanted to capitalise on how he feels.
"He trains hard, twice a day still. I do think at this moment in time, Tyson Fury is unbeatable.
"I'm not just saying it because he is my son, but he has given me the right to sit here and big him up.
"He's won everything. He's won every professional title there is to win. He's cleaned up all over the board. You will be seeing a lot more of Tyson.
"Everyone is expecting to see this man come out of the woodwork and actually give him a good fight but I ain't seen him yet."
