The impact of ageing can't be prevented. But the big question is whether that will prevent him from getting selected to the playing XI. In case he is not up to the mark, then it can create a lot of complicated scenarios. For almost two decades, Ronaldo has been like an one man army for the Portuguese team. So if he wants to participate in the 2026 tournament, can the coach deny his ambition even if he is not in good shape? But then another question will arise. If Ronaldo is not in good form, then can the coach overlook the younger players in his favor?
I am aware that Argentina coach Lionel Sebastián Scaloni has assured Messi that the door of the national team will be always opened to him. But his challenge will be age and injury. His performance might reduce due to these two factors but his experience will be relevant to the team. Portugal's former coach Fernando Santos had a strained relationship with Ronaldo. The coach even went to the extent of benching one of the greatest footballers on earth in the 2022 World Cup in Qatar. Ronaldo was not comfortable with Santos and it caused disaffection in the national team. But the current coach Roberto Martinez is ensuring that Ronaldo has the best of time and the striker is not doing badly. Martinez might still allow the five-time Ballon d'Or winner to be in his next World Cup squad but it will also depends on the performance of the striker.