Isco struck the winner from the penalty spot against his former club and celebrated passionately with a knee slide.
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This morning, upon reflection, Isco stated on social media: "I apologise to all Real Madrid fans for my cheering scene.
"I am very grateful to Real Madrid. The club will always be in my heart."
Isco spent nine years as a Real Madrid player, winning the Champions League five times and La Liga three times.