Amad struck on 120 minutes and was also sent off for his celebrations in a crazy end to a stunning Cup tie.
He said: "What a game! Today we deserved this win, we played very good, it was one of the best games of the season. It's the best goal of my life it's a really important moment.
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"You need to believe in every single moment, this is football. When Garnacho gave me the ball I wanted to give it him back but it was a good moment to shoot. I am disappointed to be sent off but what is important is to win.
"To beat Liverpool is a big, big moment for me."