Barry says the elbow problems did have a bearing on Parker's performance over the past year. "Joshua trained very hard for that fight, so did Wlad", the unbeaten Kiwi explained at his hotel near Westminster.
The popular show, about a family of gangsters in post-World War I Birmingham, is notable for the brutality, cunning and ambition of its lead character Tommy Shelby, and there is a little bit of each in Parker.
"There were chips of bone floating in both joints, stress in the sockets and severe calcification of the bones in those areas".
"The arms haven't been bale to do what they are meant to do for a long time", Parker admitted.
"If he's better than me, quicker than me, tougher than me, it will take a lot to put me away because I won't stop coming".
There are more smiles and laughter later - mainly from Barry and Parker - in their friend David Hayes' gym. So it was very important to get it done.
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The first race of the 2018 Formula One season is slated to begin on March 25 in Melbourne - the Australian Grand Prix. "I think obviously their vehicle and their package is too good", he added.
"Everything takes time. Eventually, we're gonna apply for the license, and hopefully we can fight", Mayweather told TMZ. "He's probably trying to get advice from Klitschko", Parker said.
"In Britain they have this idea of 'Joshua the Unbeatable" and they are judging me on my last couple of fights.
"We were friendly [to British media] and invited them to our home".
Parker's trainer Kevin Barry revealed they had twice delayed the surgery because of the juicy opportunities they were presented with - firstly the IBF eliminator against Carlos Takam to become the mandatory challenger and then the unexpected chance to go for the vacant WBO world title against Andy Ruiz.
According to The Daily Telegraph, "an audacious bid to sign a promotional multi-fight deal with Anthony Joshua which could earn the Londoner $500 million and make him the richest British boxer of all time". So he couldn't lead with his jab as normal and had to rely on just throwing left hooks.
"I mean ahead of his last two or three fights there are definite differences and things are really on song".
But Joshua has always lived by the mantra "stay humble, stay hungry" and his most extravagant purchase during his latest training camp is evidence that he is not straying too far from his favourite motto.