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Danielle De Rossi will still fly with AS Roma to bring the team to another three points in the match against Cagliari, at least that is what will happen when we judge from the predictions because Cagliari is just a team that is in the relegation zone and will have difficulty getting points in this match.
With these three consecutive wins, it will be seen that the decision to replace Mourinho with De Rossi was the right decision, but slowly this decision will be questioned when they face a team that is stronger or at least has the same strength as them because finally Roma started to get bad results, losing or just get a draw.
De Rossi's real test will be when he faces Inter Milan in Serie A and Feyenoord in the European League's round 16 playoffs. If he manages to get at least one point from Inter and wins against Feyenoord then doubts about his ability will begin to disappear, but because Roma is a team that is quite far from consistency so that in future matches they will get random results very high possibility.
You are right, the real challenge that De Rossi must conquer is when he has to be able to bring Roma to face a stronger team. If he is able to avoid defeat then the fans doubts about him will begin to subside a little. De Rossi actually also has to thank Mourinho for the legacy he left behind, some of the players he recruited like Lukaku were the result of his good relationship. Now Roma is approaching the top four of the standings and is only one point behind Atalanta. We know that Atalanta still has one match postponed against Inter Milan. In my opinion, that is the best opportunity for Roma to overtake them.
Apart from that, Fiorentina, Lazio and Bologna are another threat to Roma, because all three of them still have one match postponed, which means that Roma still have to be alert and have to fight to secure full points in each match so they can penetrate the top four of the standings. Facing Cagliari might be easy, but De Rossi must be able to pass the real test when facing Inter Milan, at least forcing Inzaghi squad to draw is enough.