Kell Brook believes he is a rejuventated fighter and has his sights trained on a world title in the super-middleweight division.
Two successive defeats had taken their toll on 'Special K', the first was a brutal savaging at the hands of Gennady Golovkin, the second a more painful defeat against Errol Spence in front of his partisan Steel City crowd.
It was the Spence defeat that Brook admitted hurt him most but the 31-year-old insists he has plenty left in the tank and is desperate to show it.
Kell Brook admitted to falling out of love with boxing but is hungry for a world title
Brook takes on dangerous Belarusian Sergey Rabchenko in Sheffield on Saturday
On Saturday Brook's path to redemption begins in earnest as he takes on Sergey Rabchenko at the FlyDSA Arena.
And having put a fractured eye socket and those two defeats behind him, Brook is ready to announce himself as a force at 154lbs.
'I'm not used losing but I've had two in a row,' said Brook. 'The first one I jumped up to middleweight from welterweight against the most feared man in world boxing in GGG so you can't really take that as a loss really as it wasn't my natural weight and it was a risk.
'Losing to Spence is a different kettle of fish as it was at welterweight and the other eye got smashed in and I lost my world title.
Brook wants to establish himself as a star in the super-welterweight division
'That really hurt me badly, it took me a long time to get over that. I know that I've got a lot left in me, people are right to question what I've got left and how I am going to be after the injuries and the defeats.