Wow. What a monumental collapse. Absolutely embarrassing. Shameful. It reminds me of that game against Fiorentina during Conte's reign. It's never ok to concede 4 goals, let alone 4 in 20 minutes against a slightly above average bunch of scrubs.
Great goal by Rabiot it must be said.
Sorri isn't alone to blame, but isn't mental preparation and motivation the job of a coach? He shoulders some of the responsibility no doubt, especially regarding those aspects and the element of player availability.