Luis Diaz faces financial sanctions from Bayern Munich because of his struggles learning German. The former Liverpool winger has been in blistering form since making his £65.5million move last summer.

He's registered 19 goals and 15 assists in 33 appearances across all competitions, with Bayern flying high at the top of the Bundesliga and finishing behind only Arsenal in the Champions League's league phase.

But the transition off the pitch hasn't been so smooth for Diaz. As is the case with all non-German speaking signings the club makes, he's been forced to take language lessons to learn the native tongue.

The sessions, of which he has to complete two to three a week, aren't optional, reports BILD. In fact, they're written into his £200,000-plus-per-week contract.

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If he fails to show progress, financial penalties ranging from €5,000 (£4.4k) to €50,000 (£44k) can be imposed, with the amount dependent on how much he's complied.

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The Colombian similarly struggled with English during his three-and-a-half-year stay on Merseyside. He often relied on Spanish-speaking team-mates to communicate, with Alexis Mac Allister and Darwin Nunez helping him.

Diaz recently admitted that it's been a challenge, telling Sky Sports: "The most difficult thing for me and my family was, and still is, certainly the language… but I knew that I would fit in very well here, that I would contribute to the team's success – just as I had done before in Liverpool. So FC Bayern placed their trust in me, and I'm trying to repay that trust on the pitch."

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Upon his arrival in July, Portugal international Joao Palhinha, who also speaks Spanish, acted as his translator. But he joined Tottenham shortly after.

Vice-captain Joshua Kimmich, who's seen plenty of Spanish and South American players come and go during his time at the club, took on the role.

"We have a few guys who can speak a bit of Spanish," the Germany international said. "His English is also okay. So we're managing that as a team."

Harry Kane has similarly taken his time to get to grips with the notoriously tricky German language. Speaking in December, the England skipper said he's "slowly understanding a bit more" but is still far from fluent, setting the aim of having a short conversation or completing his first interview in German by the end of the season.