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Dybala declared: "We were too sluggish during the game and too weak, and it's not the first time this season either. If we play like that, we won't win many games, especially in Europe.
"We continue to struggle to score, and we created even less than we have done in some matches in Europe. "We obviously underestimated Viktoria Plzen.
"The fact is, if we do not pick it up, we are going out of the tournament. "We have to keep fighting as we have been doing in Serie A." Roma is currently fourth in Serie A after winning five of its first seven league games this season, sitting just two points behind leader AC Milan.
