Aside from Minto, three other fighters have been added to the mix in Samoan Falani Tavu'i, Fijian Joseph Kwadjo and Kiwi Asher Derbyshire. Those four will join the previously confirmed names in Monty Filimaea, Daniel Ammann, Lance Bryant and kickboxer Israel Adesanya to complete the eight-man tournament.
The 40-year-old Minto, who has moved up and down between heavyweight and cruiserweight (90.7kg) throughout his career, said he didn't see much in the field that worried him.
"I just don't think there's any guy on my level," he said.
Minto (39-8) challenged Germany's Marco Huck (38-2-1) for the WBO world cruiserweight title in 2010 but lost via TKO. Minto has also competed in a similar three-round knockout tournament, as a heavyweight, in England in 2013.
The rest of the Super 8 card, that will be staged at the Horncastle Arena on March 28, includes a 10-round cruiserweight bout between Kiwi-trained Samoan Vaitele Soi (24-1) and Australian Anthony McCracken (17-7-1).
Cricketer Jesse Ryder will also meet blogger Cameron Slater in a celebrity fight, while former English cricketer Adam Hollioake has challenged ex-league player Monty Betham and both parties are keen to make the bout happen.