Wladimir Klitschko

He has also barred her from watching the fight on TV, and she will be informed of the outcome via a telephone call.

His father Robert will be among the 90,000 at the stadium on Saturday but mum Yeta Odusanya will be at home in north London.

Joshua said: "My old man will be there but I don't really let my mum come to my fights.

"I've banned her. It's not a place where you want to see your kid, I don't think, at a fight. My dad can watch it, but not my mum.

The Sky Sports Box Office world heavyweight championship fight has brought American broadcasters together because Joshua has an exclusive deal with Showtime but Klitschko is tied to HBO.

Showtime's live broadcast at live at 4:15 p.m. ET/1:15 p.m. PT will be followed by HBO at approximately 10:45 p.m. ET/PT.

"This happened before in the Mayweather vs. Pacquiao and the Lewis vs. Tyson fights and shows you the magnitude of our event at Wembley Stadium on April 29," said Klitschko's manager Bernd Boente.

The Ukrainian had been the world's No 1 heavyweight for more than a decade but will be the challenger for Joshua's IBF and the vacant WBA 'Super' titles when they meet on April 29, live on Sky Sports Box Office.

A sell-out crowd at Wembley of 90,000 will dwarf any attendance at Klitschko's previous fights, even during the five years he was unified champion.

"I had maybe 40,000, 50,000, 60,000 but never 90,000," he told TalkSPORT.

Lewis is also convinced the 40-year-old would not have lost to Tyson Fury with Steward in his corner, and that Klitschko's biggest challenge in preparing for his April 29 Sky Sports Box Office fight with Joshua comes in shifting his focus from Fury.

Joshua defends his IBF heavyweight title against Klitschko at Wembley Stadium on April 29, live on Sky Sports Box Office, and the vacant WBA 'super' title is also at stake.

The WBA's attempts to create one title holder were derailed last year, with Lucas Browne testing positive for a banned substance shortly after winning the 'regular' title, while Tyson Fury relinquished the 'super' title to focus on problems outside the ring.

Joshua will bid to add the WBA ‘super’ belt to his IBF title when he faces the division’s former kingpin, live on Sky Sports Box Office.

The second batch of tickets took less than an hour to sell out when they were released on Monday lunchtime and the total sales have beaten the previous record set by Carl Froch’s rematch with George Groves at Wembley in 2014.

Promoter Eddie Hearn said: “The demand for tickets for Joshua vs Klitschko is phenomenal - this is unquestionably the biggest fight in British boxing history and we would have sold out Wembley twice over.

Joshua, whose IBF heavyweight title will be up for grabs against Klitschko live on Sky Sports Box Office, offered "respect" to his veteran challenger's fighting style but insisted he preferred to watch risk-takers inside the ring.

Former unified world champion Klitschko said: "I think trainers and fighters have been studying my style and they are aware I can knock people out with both hands. I showed it many times.

The pair were in discussions to fight on December 10 but talks stalled due to uncertainty over whether the WBA title would be on the line and Klitschko (64-4-53KO) sustaining a minor calf injury.

Joshua (17-0-17KO) will instead press ahead with a defence of his IBF world title on that same date in Manchester against an as yet unconfirmed opponent, before potentially taking on Klitschko in the spring of next year.

Fury was scheduled to defend the WBA and WBO titles he took off Klitschko last November on July 9, but the Briton cancelled the bout due to a sprained ankle.

It was confirmed on Wednesday that Klitschko will get the opportunity to gain revenge for that surprise loss in Dusseldorf when he goes toe-to-toe with Fury in the Englishman's home city next month.

"I'm delighted that we can finally get the fight back on and in Manchester on October 29th," the defending champion's coach and uncle Peter Fury said.