Ben threw social media into a tizzy Thursday as a lot of folks were shocked to learn he's bilingual ... despite the fact it's something of an open secret.

Ben sat down with El Cine En La Ser for an interview about his film ... explaining why Michael Jordan himself doesn't appear in the movie about his groundbreaking Nike contract.

If ya don't have the gift of gab en español, fear not, we did the translation, and Ben says there's not an actor in the world who could make an audience believe they're MJ, so the movie tells the story without focusing on Michael.

Still, Ben says he wouldn't have made the movie without Mike's blessing, which is why he had a sit down with the legend ... who told him the most important parts of the story were nailing 3 characters ... Howard White, George Raveling and MJ's own mother.

It's funny ... Ben says Jordan told him they had to get Viola Davis to play his mom, which Ben jokes is like asking someone to play basketball and they will only do so if MJ's on their team.

Ben's explained the same stuff in English, but it's impressive to hear him say it in Spanish -- which, btw, he learned in his youth ... pre-J Lo.