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Zlatan Ibrahimovic says he's a big fan of David Beckham's plan to bring Lionel Messi to MLS -- telling TMZ Sports the Argentinian superstar should "absolutely" come to the U.S. in 2020.

Beckham is reportedly targeting Messi to lead Inter Miami for the team's inaugural season in 2020 -- and there's talk Becks is willing to write a MASSIVE check to get the deal done.

Of course, Messi is in the middle of a deal with Barcelona -- which doesn't end until the end of the 2020-21 season ... but hell, anything's possible if the price is right.

Enter Zlatan ... who left Manchester United to play for the L.A. Galaxy earlier this season -- and seems to be loving it.

So, when we saw Zlat leaving Avra in Beverly Hills on Monday -- We asked what he thought about Messi possibly following his lead.

He likes it.

Meanwhile, you see the insane goal Zlatan scored this weekend? The 500th goal of his career??