Atletico reach the quarterfinals 2-1 on aggregate thanks to Renan Lodi's winner at Old Trafford.
Oblak said, "For me, every one of our players was Player of the Match. It was a tough game in which everyone played their part. We know how hard it is to come here and win, so we're happy with the job.
"It's a great moment in what's been a tough season. We've improved of late, though, and we've won a really important game here tonight that will give us confidence going into the quarter-finals."
Oblak also reflected on his early save from Anthony Elanga.
He added: "If they'd have scored early on it would've been tough to come back into the game. Luckily, the ball hit my face – these things happen!"
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