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Lionel Messi was just hit with a fine for his in-game tribute to late soccer legend Diego Maradona -- but it only amounts to $725.

... which is NOTHING to a rich guy like Messi.

The 33-year-old captain paid homage to his fellow Argentinian after scoring the final goal in Barca's 4-0 win over Osasuna on Sunday ... by ripping off his shirt to reveal a Maradona #10 jersey from his Newell’s Old Boys days.

It was an emotional moment for Messi ... who blew a kiss to the sky and hugged his teammates following the goal.

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