"It sounds like a fantastic idea to me," the 56-year-old told reporters yesterday at FIFA's Zurich headquarters.
"This will give more possibilities to countries that have never reached that level of competition," he added.
The hobbled Maradona spoke dripping with sweat after rumbling his way through a mini-tournament involving former football greats and current executives.
FIFA president Gianni Infantino has organised a series of so-called "Legends Tournaments" since taking charge of the body last year, playing alongside former football stars in front of assembled media.
"The quality will not fall," Maradona said when asked about those concerns.
Infantino has been courting support from the game's most powerful figures ahead of the FIFA council meet.
The influential panel will review five proposals on today: leaving the World Cup unchanged at 32 teams, two proposals for a 40-team competition and two 48-team scenarios.
Infantino is said to be backing a 48-team option with 16 groups of three, which would come into effect for the 2026 competition.
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