De Zerbi was left furious by the decision to give the handball, even referencing Madrid's weekend controversy that saw Dean Huijsen sent off in La Liga.
He said: "It’s a shameful penalty. It’s not there. I would have said that too if it had been whistled for us. For me, it's not a penalty, never. Not at the Bernabeu, nor at the Velodrome, nor at Real Sociedad, nowhere. And I have no ulterior motive, I don't want to cause controversy. I'm just saying that there was no penalty. Period."
He also reflected on Carvajal's red card, saying: "In this kind of situation, head-to-head, I wouldn't give a red card. It's not violent. But it's the rule. For Real, for us, for everyone."