Paz's goal was crucial as Real eventually won 4-2 on the night.
He said, "I'm very happy, it's a dream and for a moment I didn't even believe it.
"The goal? I dared, I was in automatic mode, I hit the ball and I went crazy. We are a great group, there is a great atmosphere in the locker room and I thank my teammates for the support. (Carlo) Ancelotti? The coach complimented me like the whole team."
Paz also said: "We have one of the best youth sectors in the world, if not the best, and we are here to make a contribution to the first team."