Bernal struck as Barca thrashed the Toon 7-2 to win the round of 16 tie 8-3 on aggregate.
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"They are unique moments, they do not cross your mind even as a child," said the 18 year-old.
"I am happy to be able to help the team with goals."
Bernal also said: "They pushed a little harder in the first half, but the penalty goal went well for us to start the second half."
On facing Atletico Madrid in the quarterfinal, the youngster added: "This is the Champions League and I don't care about the rival."