British promoter Eddie Hearn announced the highly-anticipated sequel for December 7 a fortnight ago but Ruiz, the WBA, WBO and IBF champion, initially disputed the venue.
Reports suggest Mexican-American Ruiz has been swayed by a larger cut of the revenue than his initial share of $15m for the mega-fight dubbed "Clash on the Dunes".
"I dethroned the king June 1st and made history becoming the first Mexican/American champion of the world," Ruiz wrote in a tweet confirming his acceptance.
