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Perhaps not many believe that PSG winning but that is happen. Worked very hard and contribution from all players give a nice result for PSG. But that will not stop on that because they want to be the winner in the next events. The team need to prepare many things for the next events so they need to realize that their journey will be more difficult than before. PSG will match with Atletico Madrid and although that will not easy for PSG, Luis Enrique said that their team will revenge in that match.
What you said makes sense, considering PSG journey will be more difficult than before, all clubs will prepare their players to perform more optimally in the upcoming matches. It is not impossible that PSG can be eliminated faster than imaginable, therefore they should not be complacent about the wins they have gotten before, train harder, improve coordination between players to be better, etc.