La Dea will face Bayer Leverkusen in the final after victory over Marseille in last night's semifinal.
De Roon said: There are no words.
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"There is pride, we were fantastic tonight. We must enjoy these celebrations. Then head on to the next one, but going to the final in Europe for a team like Atalanta is something extraordinary.
"Congratulations to us players, the staff and the fans."