To be honest, I don't really follow the development of the teams competing in Serie A. so, I don't really know any developments. but that doesn't mean I can't find out the statistics of the teams competing in Serie A, including AS Roma. what is certain is that AS Roma is experiencing unstable performance even though AS Roma actually has a pretty good front line, and Mourinho should be able to maximize it. I don't know why Serie A teams prefer the 3-5-2 pattern, even though there are still many ideal systems. the 3-5-2 pattern is actually effective, but it must be filled by competent players in each position. at least Inter always uses this pattern, but Simone Inzaghi is smart in placing his players and implementing his strategy. at a minimum, he knows when to rotate players depending on the opposing team. well, Jose Mourinho should have been smarter because in fact Mourinho has long experience and has brought several clubs he has managed to success to become champions under his tutelage. however, what we are seeing now is not that special in Mourinho's hands.
Talking about the playoff match between Feyenoord versus AS Roma, to be honest I quite doubt AS Roma. moreover, the first leg match was held at home to Feyenoord. referring to the betting market for a while, the home team is favored by bookies. so, the question is whether Mourinho will remain loyal to his defensive system in his away matches, especially the match against Feyenoord. if so, it could be that the home team will take advantage to win the match and maximize every opportunity to score a goal. however, this match actually still has quite a long time lag. there is still time for AS Roma to improve its performance.
The Serie A is one of the top league in the football World, with alot of great history in top European competition, it's got clubs with good strategy as well. We'll as we all know José Mourinho is a defensive manager a very good one at it, known for parking the box especially when he's having the lead in a game, we'll over the years it's favoured him cause he's won lot of trophies in different leagues with such strategy and even got to the finals in the Europa League against Sevilla last season.
Their is tendency that Mourinho could change from his defensive pattern and go all attack against Feyenoord, cause currently it's not really favoring the club, except he would introduce players that are very good defensively into the team, cause they've been in a very poor form lately and have lost some few important matches. Well just like you mentioned, there's still time to improve their performance before this match based on the long time lag and I hope Mourinho utilises the current ongoing transfer window and strengthen his team very well.