Sprechen Sie Deutsch? No. That's a big problem

At Bayern Munich, contracts are precise instruments. Nothing is left to chance - not even grammar.

The German champions are known for their discipline, and that extends beyond the pitch. According to Bild, foreign signings are required to attend mandatory German lessons, two or three sessions per week, with measurable progress assessed through internal evaluations.

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And this isn't a friendly suggestion. It's written into the contract. Failure to attend or show improvement can result in financial penalties.

The Colombian winger has admitted that adapting to life in Germany hasn't been straightforward. In an interview with Sky Deportes, he revealed that the language barrier has been his biggest challenge since arriving in Munich.

"The hardest thing was, and still is, the language," Diaz said, stressing that he is working to repay the club's faith through his performances. On the field, he has delivered. In the classroom, progress has reportedly been slower.

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As per Bild, fines for insufficient improvement, measured against the Common European Framework of Reference for Languages, could range from €5,000 to €50,000.

At Bayern, success is not defined solely by goals or assists. Discipline, integration and commitment matter just as much.

For now, there is no immediate sanction, only scrutiny. But while Diaz continues to impress with the ball at his feet, his most important test may currently be taking place behind a desk.