Neymar, Brazil’s all‑time leading scorer with 79 goals, has not played for the national team since suffering a serious knee injury in October 2023 and has struggled with consistency since returning to Santos last year.
Brazil coach Carlo Ancelotti has repeatedly said Neymar will be considered if he is fully fit, adding in April that the striker has two months to show he is ready.
"We want the best players to be there (at the World Cup) and Neymar, no matter his form, will always be one of them," Messi said on Lo del Pollo show.
"It would be wonderful to see him at the World Cup because of what he means to Brazil and to football."
Messi, who captained Argentina to the World Cup title in Qatar in 2022 and is expected to make his final appearance at the tournament, also listed Brazil among the contenders for the 2026 edition, alongside Spain and France.
"I still believe Brazil is always a contender and has the players necessary to compete for the title in any major tournament," he said.
The 2026 World Cup, co‑hosted by Canada, the United States and Mexico, will begin on June 11.
