Iran Press/ Europe: Captain Mikel Oyarzabal netted the winner by sending keeper Unai Simon the wrong way from the penalty spot in the 63rd minute after strike partner Portu was felled in the area by Athletic defender Inigo Martinez.
Martinez, a boyhood Sociedad player who left for their rivals for 32 million euros ($37.64 million) in a controversial transfer in 2018, was initially shown a red card for the foul but the referee downgraded the punishment to a yellow card after a VAR review.
Sociedad dominated possession and Athletic failed to test their opponents on the counter-attack, still offering little in attack even as they chased the game deep into the second half.
The match was postponed by a year at the request of both clubs to ensure fans could attend, meaning Athletic surrendered a potential Europa League berth.
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