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BBC Sport Wales understands that Joe Calzaghe will make the 15th defence of his WBO super middleweight against an American opponent.
Either Scott Pemberton or Kabary Salem are being lined up for the open-air bout at Edinburgh Castle on 22 October.
All-action fighter Pemberton boasts two recent wins over Omar Sheika, whilst New York-based Egyptian Salem is off a disputed loss to Mario Veit.
Edinburgh's Alex Arthur will defend his IBF Intercontinental title on the bill.