Speaking to reporters after the game, De Rossi said: "We have to analyse when things aren’t working and the fact is after each of the Europa League games, we had a bad first half in the next Serie A match. And every time I moved to a three-man defence and saw improvements. Well, I tried it from the start this time and evidently, that’s not the issue.
"Whenever I saw the team running on empty, I tried to move them back to a system they used for many years and felt comfortable with. I remember they were very difficult to score against when playing with five at the back."
He added: "However, maybe they are rejecting that system now, like a body with a new organ! I felt like we could win it when we equalised and conceding the second goal was against the run of play, that could knock the wind out of our sails, but the penalty save kept us alive."