UEFA says Wenger faces a charge of improper conduct.
UEFA has not fixed a date for the hearing, though its disciplinary panel’s next scheduled meeting is March 29.
Wenger is facing his third touchline ban from UEFA in the past year.
The French coach accused Slovenian referee Damir Skomina of awarding Milan too many free kicks in Arsenal’s 3-0 win on Tuesday.
Arsenal was eliminated after losing the first leg of the last-16 tie 4-0 in Italy.
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