Felix says he was so amazed by the Anfield atmosphere that he was actually happy to experience the home goal - before Atletico went onto win the second-leg and Champions League round 16 tie.
He said, "It was incredible. I shouldn't even say this, but when it was their goal, seeing the stadium, the way they celebrated ... I was used to watching it on TV, but watching it live is a very good atmosphere. Almost nobody wins here, we are very very happy."
Felix also was happy to see Reds boss Jurgen Klopp, who had praised him going into the game.
He told Eleven Sports: "When I came across him I made a point of thanking him. He gave me a hug."