Atletico Madrid captain Koke felt Memphis Depay was key after their Champions League victory against Inter Milan.
Atletico won on penalties after Depay struck to bring the round 16 aggregate score to 2-2 late in normal time.
Koke said: "The introduction of Memphis [Depay] changed the game and then we have one of the best goalkeepers if not the best in the world, and he has demonstrated that today.
"When we all show this attitude, this intensity, this concentration, we are a completely different team than what we have seen in recent games especially the ones away from home. I hope we can continue to reach this level of football that we are showing here at home.
"There are a lot of things to improve, but tonight is a night to enjoy because we have produced a great performance against a very difficult side."
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