The Gers pulled out of the tournament after backlash from their supporters, which included a banner being unfurled at Ibrox, which stated: 'Money over morals, no derby friendlies'.
Celtic fans also weren't happy with the original competition concept and had their own banner which read: 'Shove your 'Old Firm' friendly up your a***'.
However, the Toffees have now replaced Rangers and their arch-rivals seem pretty chuffed about it.
"The Sydney Super Cup just got bigger and better!" the Scottish champions tweeted after Frank Lampard's side were confirmed as the fourth team that will take part in the tournament.
Celtic will take on Everton in the newly-created competition at the Accor Stadium on November 20, with squad players who aren't going to the World Cup taking part.
That clash will be part of a three-match series that will also feature Australian sides Sydney FC and Western Sydney Wanderers.
Celtic manager Ange Postecoglou and his new assistant Harry Kewell will return to Australia, with the Hoops boss having won the Asian Cup with the national team in 2015.
Kewell made 58 caps for his country, scoring 17 goals, as well as playing in two World Cups.
Many Australians will also be keen to see the Toffees in action after Socceroos legend Tim Cahill's successful career at Goodison Park.