Trailing 2-1, Svilar saved a penalty from Cristiano Biraghi before Roma equalised in injury-time.
De Rossi later said: "Mile is a fantastic boy. He is working well, supported by the staff, the goalkeeping coach and Rui (Patricio). He saved a fairly generous penalty, if we have to talk about choices.
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"It was decisive."
But De Rossi added, "If we think we can go into Brighton like we did tonight, it will be a bad evening."