Athletic Bilbao defender Yeray Alvarez has been given a 10-month ban for taking a banned substance found in a medicine used to prevent hair loss following his cancer treatment.

The 30-year-old Spaniard tested positive for canrenone following a 3-0 defeat by Manchester United in the Europa League semi-finals in May.

Canrenone is a diuretic that can sometimes be used as a masking agent.

Uefa accepted Alvarez’s defence that he mistakenly ingested the substance by taking a preventative medicine for alopecia which contained canrenone.

Alvarez, who was diagnosed with testicular cancer in 2016, said he had been taking the medicine as part of his treatment for hair loss ever since.

Although Uefa accepted Alvarez’s explanation and said he did not intend to take a banned substance, he was found guilty of committing a “non-intentional anti-doping rule violation”.