Barcelona and Hansi Flick are sweating on the fitness of 17-year-old star player Lamine Yamal.
Lamine Yamal's injury setback has given Barcelona serious cause for concern ahead of a packed schedule.
The teenager was in action for Spain in their UEFA Nations League victory over Denmark.
However, he sustained an injury late in the match and was subsequently ruled out of Tuesday's clash with Serbia.
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Lamine Yamal injury update
The good news is, an initial MRI scan has revealed Yamal avoided a serious injury. Spain's football federation confirmed,
"Tests have not detected any structural injury, and the RFEF medical services confirm that it is an overload."
Yamal had been named in Luis de la Fuente's starting XI for the Denmark match, playing almost the entirety before being withdrawn due to injury, and while he has avoided any serious damage, his availability for Sunday's La Liga meeting with Sevilla is in doubt.
Barca boss Hansi Flick is already dealing with a lengthy injury list, including Marc-Andre ter Stegen, Ronald Araujo, Andreas Christensen, Marc Bernal, Gavi, Fermin Lopez, and Dani Olmo.
While Gavi and Olmo are expected to return soon, Yamal is likely to miss this weekend's game, but may return to face Bayern Munich next week.
The wonderkid has been in eye-catching form, registering four goals and five assists in nine La Liga matches this term, following an amazing breakout season and summer at the Euros.
With Barcelona facing Bayern Munich in the Champions League and Real Madrid soon after, manager Xavi will be desperate for Yamal to be involved in those battles.