Chelsea and Malmo have been charged by Uefa following supporter unrest during their Europa League match in Sweden on Thursday.
Chelsea have been charged over field invasions by their supporters, and Malmo for setting off fireworks.
Both clubs have been charged with the throwing of objects by their fans during the last 32 tie, which Chelsea won 2-1.
Talking of the atmosphere at the Swedbank Stadion after the game, Maurizio Sarri said: "The atmosphere was like a little Naples. They are usually 50,000, it was wonderful. They are a physical team and you have to gain the qualification.
"We have to play and they are very compact. They didn't surprise us, I knew them well. I saw their Europa League matches and in their pre-season."
In addition, Valencia's Geoffrey Kondogbia has been charged with receiving a yellow card on purpose during his side's Europa League game at Celtic.
All the cases will be dealt with by Uefa's Control, Ethics and Disciplinary Body on February 21.
Chelsea are already facing an investigation into alleged anti-Semitic chanting during their match against MOL Vidi in Hungary two months ago.
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