1) If Portugal and Argentina top their respective groups
If Ronaldo's Portugal and Messi's Argentina top their respective groups then they will be in separate halves of the round of 16 stage. In such a scenario, a Ronaldo vs Messi clash could take place in the World Cup final, on December 18 in Lusail, but for that, both teams will have to reach the final first.
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Once Portugal top their group, they will most likely face Serbia or Switzerland from Group G. Belgium would be the team waiting for them in quarters, while Ronaldo's side will have to steer past France/England in the semifinals to reach the summit clash.
For Argentina, Denmark would be waiting in the round of 16. Messi would have to inspire his side over Netherlands in the quarters, while Spain/Brazil would be the final obstacle in the semis before a World Cup final featuring Ronaldo and Messi could take place.
Cristiano Ronaldo and Lionel Messi are heading to their fifth World Cup pic.twitter.com/4biMTneri0
— GOAL (@goal) March 29, 2022
2) If Argentina top their group, but Portugal finish 2nd in group H
If Messi's Argentina can keep a flawless record in the group stages, and Portugal finish second in their group, the clash of the titans could take place in the semifinals. We already know how Argentina would progress after winning their group via this permutation, but Portugal's route would change.
Fernando Santos' side will have to fight with Brazil in the round of 16, and after that, Spain would await in the quarterfinals, before a Messi vs Ronaldo showdown in the semis.
Lionel Messi will become the youngest ever player to take part in 5 FIFA World Cups at 35 years of age. Younger than Gianluigi Buffon at 36, Antonio Carbajal at 37, Cristiano Ronaldo at 37, Lothar Matthaüs at 37 and Rafael Márquez at 39 years old. This via TyC Sports. pic.twitter.com/cuPPHizxGi — Roy Nemer (@RoyNemer) April 1, 2022
3) If Portugal top their group but Argentina finish 2nd in group C
Again, Ronaldo and Messi would meet in the semis via this permutation, and we already know Portugal's route, but Argentina will face daunting trips ahead of they finish second in Group C. Lionel Scaloni's team would have to beat defending champs France in the round of 16, and after that, England would await them in the quarters. Then, it will be Portugal in the semis.
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4) If both Portugal and Argentina finish 2nd in their respective groups
By this permutation, Ronaldo vs Messi clash could happen in the final, but they will have to beat all the strong teams, we've mentioned before in points 2, and 3.
Ronaldo & Messi are heading to their World Cup pic.twitter.com/G9QJ1cAMrs — 433 (@433) March 29, 2022
For the unversed, Ronaldo and Messi have never faced off against each other in the World Cup, it was possible in World Cup 2018, but both sides were eliminated in the round of 16 before a probable star-studded quarterfinal clash could have taken place.