The incident occurred during Verona's 2-0 win at Livorno on Saturday.
Morosini collapsed and died of a heart attack during Livorno's Serie B match at Pescara in April. Forensic tests revealed he suffered from an inherited heart disease. All matches in the top divisions were suspended on the weekend of his death.
Verona apologized and attempted to disassociate itself from the "ultra" fans who committed the offence, but it caused a storm of outrage.