Roma's back line under EDF has been all over the place. One CB is playing a trap, one is covering. Fullbacks are never in line. Sometimes they are playing high against a 9 man team and they concede. Sometimes they are playing 3 at the back with players who never play.
I thought Roma's organization all year has been really poor. Huge gaps in midfield every match.
I don't really know what the thought was against Porto. It was like a 3-4-2-1 and Porto scored almost immediately. Just play 4-5-1 and counter, game is over.