If both Argentina and Portugal make it, they will meet in the final in Qatar. This means that Messi could face Ronaldo in the World Cup final. Selecao take on Morocco in the quarters, while Albiceleste face the Netherlands. If Ronaldo and co win, they would play England or France for a place in the final. If Argentina win against the Netherlands, then Messi would then play Brazil or Croatia in the semi-finals.
However, if Argentina win, they would also have to play Portugal or Argentina in the quarter-finals. Therefore, the biggest possible rivalry in football would be created if Messi and Ronaldo won the title. They have both qualified for the quarters in Qatar and are just two wins away from the World Cup final. It means that both Messi and Ronaldo are getting ever closer to winning the World Cup.