Atletico face the prospect of a trophyless campaign this season.
Oblak said: Football changes very quickly, from game to game. On Thursday we were all disappointed, there was excitement about the Cup. The team has to trust, believe and have ambition to achieve bigger things.
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"It is not enough to think that if we are fourth it is fine. It's not right and we have to be demanding with ourselves.
Against Inter we have to do everything to come back, leave everything out there and I hope we can do it, and continue in the Champions League, and finish as high as possible in the league even though we are far from first."