Oblak's shootout heroics saw Atletico defeat Inter Milan in the round of 16 after the aggregate score had finished at 2-2.
He later said: "I always say that penalty shoot-outs, in the end, they are a bit about luck because you have to pick the right side. You have to save the ball and I think if the player hits it perfectly, it's impossible to save.
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"Luckily, today I could save them, but what is important is the victory and that we are through to the quarters.
"The atmosphere was fantastic as always at home. The fans, the stadium: they never disappoint. We may fail, but they don't, and again today they have been decisive. They helped us a lot."