Girona trailed 2-0 to the Spanish giants in Saturday's clash at the Johan Cruyff Arena when Girona were awarded a penalty just before half-time.
Up stepped Saiz who coolly chipped his spot kick down the middle of the net as 'keeper Inaki Pena dived to his left hand side.
Barcelona went on to record a 3-1 victory via spot kicks of their own from Gerard Pique and Memphis Depay, either side of a Rey Minaj strike.
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Saiz, now 30, spent a season and a half with Leeds between July 2017 and December 2019 before joining Getafe on loan.
The Spaniard then signed for Segunda Division outfit Girona the following summer.
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Thank you Laura Collins