And the Watford puncher will have the WBA super, IBF and IBO world heavyweight titles on the line when he gets in the ring with 36-year-old Pulev.
Tickets range from £40 to £1,500 for the bout at the 74,000-capacity ground in Cardiff, which hosted last season’s Champions League final between Real Madrid and Juventus and has an impressive retractable roof.
Joshua had wanted to face Wladimir Klitschko once again after their belting bout at Wembley Stadium earlier this year.
But he was obliged to face Pulev after the Ukrainian legend pulled out.
And with the tickets going on sale on Tuesday, the public have been quick to snap up seats on StubHub.
Eddie Hearn tweeted: “Ticket update – through 50,000 sold – £80, £100, £500 & £1500 SOLD OUT – £40, £60 and £300 still available.”
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Anthony Joshua vs Kubrat Pulev - Betting tips
Anthony Joshua defends his heavyweight titles against mandatory challenger Kubrat Pulev on October 28 - here's our view on the fight...
DIAMOND – AJ to win by KO, TKO or DQ in the First Round: “AJ is known for his devastating power and boasts an astonishing 100 per cent knockout record.” (10/1 – add to your betslip)
NEXT BEST – Joshua to win by KO, TKO or DQ in the Seventh Round: “Pulev is experienced and may hold his own for the first half of the fight.” (8/1 – add to your betslip)
LONG-SHOT – Pulev to win KO, TKO or DQ: “He’s a massive underdog but heavyweight fights throw up a shock every once in a while.” (12/1 – add to you betslip)
He later updated fans saying 60,000 tickets had been sold.
Joshua said on Monday: “I’m looking forward to expressing a different approach to my boxing skill.
“It’s about finesse, it’s about out-classing your opponent.”
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Anthony Joshua vs Kubrat Pulev - Betting tips 