I myself was quite surprised that Atalanta could lose to Club Brugge in the first match and this, Atalanta must be hurt because their defeat occurred because of a penalty kick in the last minute in the second half of the match which made this match have to accept defeat for Atalanta if there was no violation it might have only ended in a draw, Club Brugge was lucky to get a violation in the final minutes of the match which brought them victory in the first leg, and I also think that Atalanta will most likely take revenge in the second leg, they have big ambitions for the champions league this season.
I am very positive for Atalanta and I am not worried about them at all. Club Brugge were very lucky to win the first leg and they won the match in the last minute. After the two teams were level in the first half, it seemed that the match would end in a draw in the last minute of the second half. But Nilsson's penalty in extra time of the match declared Club Brugge as the winners of the match. I firmly believe that Atalanta will come back stronger in the second leg and avenge the first leg defeat.
Even though luck played a part in Club Brugge win against Atlanta you still cannot discredit Brugge because they really worked hard for the win. They were the ones who scored first before Atlanta, they unto the ball in terms of possession more than Atlanta, they completed more passes than Atlanta. Atlanta were only ahead of them in terms of shot on target and that's even by only one. Brugge had 4 and Atlanta had 5. For Atlanta to win, they need a comeback for it. Brugge on the other hand only needs a draw to qualify. May the best team win though.