imo, letting go of Strootman hurt them too much. him and De Rossi controlled the midfield so well in their 3421 in the games ive seen, allowing them to reach the CL semis and 3rd place in Sere A. they went from 2nd/3rd best team in Italy to worse than inter and Lazio, possibly Milan as well. it will take a monster season from Dzeko, Manolas and their wingbacks to get to CL places again. really bad summer for them, after a couple of soilid ones.
oh and Under sucks, Serrie B level player