Atletico won 2-1 in the first-leg of their Champions League quarterfinal.
Griezmann said: "We have won, which is the important thing. The ending doesn't matter.
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"It's a shame about the goal conceded and that feeling of having been all behind at the end defending, but it's important to win the first leg in the quarterfinals. To rest well and go to Germany to win too.
"They had the ball in the second half, they put us behind. We will have to see the atmosphere in Germany, we already know this stadium. You will have to know how to suffer and win. We have the level to go to the semifinals. You have to prove it."