Fiorentina coach Vincenzo Italiano was stunned by their 4-0 defeat to Torino on Monday night.
Wilfried Singo, Antonio Sanabria and a Josip Brekalo brace did the damage for Toro.
“I cannot understand why we put in this inexplicable performance," coach Italiano told DAZN.
“The first half was particularly awful and we'd never before seen anything like this in terms of concentration or approach. I saw the complete opposite of our usual mentality.
“Perhaps it will be of use and bring us back down to earth. We play again in three days and I hope to see a very different Fiorentina.
“I really didn't expect this performance. I hope it was just a blip and we can get right back on track.
“It was a negative performance from everyone at Fiorentina and I don't want to focus on any individuals. We've all got to restart with the right attitude."