UEFA acknowledged that the 30-year-old took the substance "involuntarily", with Alvarez saying it been through medicine he was using to combat hair loss following treatment for testicular cancer.

La Liga: Athletic Bilbao defender Yeray Alvarez given 10-month doping ban

Alvarez said his positive test came after Bilbao's 3-0 home defeat by Man United in the Europa League semi-final first leg on May 1.

La Liga: Athletic Bilbao defender suspended for 'involuntary' doping; club vows to back him

Sevilla squandered the chance to go level on points with second-placed Real Madrid in La Liga as they could only draw 1-1 at home to Athletic Bilbao on Friday in their first game back after a two-week winter break.

La Liga: Sevilla miss chance to catch Real with draw against Bilbao

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La Liga: Athletic Bilbao defender Yeray Alvarez given 10-month doping ban

La Liga: Bilbao defender Yeray Alvarez suspended for 'involuntary' doping

La Liga: Sevilla miss chance to catch Real with draw against Bilbao