The French superstar believes he was sidelined by PSG and made to train with players the club were trying to offload after refusing to agree a new contract.
New head coach Xabi Alonso will make his debut on the Real bench for the Group H match at Hard Rock Stadium and could be without several regulars.
Mbappe has repeated his desire to win Europe's biggest club competition, but the closest the Paris-born forward got with his boyhood club was losing the final in 2020 to Bayern Munich.
After the Catalans scraped a comeback win at Valladolid on Saturday, Madrid survived a late Celta fightback to maintain the four-point gap ahead of next Sunday's Clasico.
Mbappe idolised Ronaldo while growing up and after joining Madrid from Paris Saint-Germain last summer, has equalled the Portuguese striker's tally of 33 goals in his first season at the Santiago Bernabeu.
Mbappe's double took him to 33 strikes in 44 appearances across all competitions, the same number of goals as his idol managed in the 2009-10 campaign.
The French superstar did not train with his team-mates on Tuesday ahead of the game but coach Carlo Ancelotti said the striker would travel to San Sebastian.
The Italian coach said that he was never in doubt that the 26-year-old forward was going to find his form despite a slow start in the Spanish capital after arriving from Paris St Germain, playing in a more centralised role up front.
Speaking on a podcast hosted by former Brazil striker Romario, Neymar blamed a clash of egos for the failure of the three stars to gel during their spell together at the French club.
France star Kylian Mbappe said on Thursday that Pele's legacy "will never be forgotten" after the Brazil legend died at the age of 82.
Normal service is set to resume in France on Wednesday with Kylian Mbappe and Neymar both set to feature for leaders Paris Saint-German as they restart their Ligue 1 season, 45 days after it was popped on ice for the World Cup, with a home game against struggling Strasbourg.
Lionel Messi finally has 'his' World Cup after defeating France in a penalty shootout in one of the most exciting finals in World Cup history.
Geoff Hurst said he had enjoyed a "good run" after France's Kylian Mbappe became just the second player after the England great to score a hat-trick in a World Cup final.
The era of Messi and Ronaldo has almost ended. It is unlikely that we will see either of them in the next World Cup and it is looking more and more likely that they will retire from football sooner than we can bear. That being said, it is time for the next GOAT to step up and claim his position, whoever that may be. As things stand, Kylian Mbappé just might be that GOAT we are looking for.
Despite the fact that Bangladesh are not taking part in the FIFA World Cup, it has not diminished any kind of excitement or interest amongst Bangladeshis who have ridden the World Cup wave and lived the frenzy. .Argentina, Brazil, France, Germany, and England fans have driven the World Cup
The 2022 FIFA World Cup in Qatar has entered the knockout phase, and one of the top honours players will be competing for is the Golden Boot, awarded to the player with the most goals in the tournament.
After putting Belgium, Portugal and Spain to the sword in Qatar, Morocco are looking to bring another soccer superpower to their knees when they face France in the World Cup semi-finals on Thursday.
Kylian Mbappé is one of the most popular athletes on the planet. Only 23 years old, he is already one of the most recognised French footballers and a world champion. Still very young and already the second most expensive player in football, Mbappé has already bagged a number of trophies that many players hunt for their entire life. When Messi and Ronaldo are gone, we will be focused on Mbappé that is for sure.
France head into Saturday's heavyweight World Cup quarter-final clash with England well aware that their hopes of carrying on in Qatar and retaining the title rest on the shoulders of Kylian Mbappe.
