Martino has recently been replaced by Luis Enrique in the Camp Nou top job after the Catalan giants failed to win a major trophy last season.
But after watching Messi at close quarters throughout the campaign, he is convinced his compatriot can fire Argentina to their first World Cup success since 1986.
"He's only (a) 27-year-old (Messi is actually 26) and can still beat many records," he is quoted as saying by Football Espana.
"The World Cup is at an optimal time. It's time for this generation of players to win the World Cup.
"Argentina has a lot of strength and is very competitive."
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