Athletic Bilbao player Yeray Álvarez says he has been provisionally suspended after falling a banned substance test due to taking a medicine to prevent hair loss caused by cancer treatment. The Spanish defender said in a social media post Thursday that he had been informed “some weeks ago” that he had failed a drug test after Athletic lost to Manchester United in the Europa League semifinals in May.

The 30-year-old defended his position, stating that he unintentionally ingested a banned substance in medicine used to treat alopecia.