Lazio have avoided immediate punishment for their fans' alleged racist abuse of AC Milan players in last week's Coppa Italia clash.
Milan claimed that monkey chants were directed at midfielders Franck Kessie and Tiemoue Bakayoko in their 1-0 semi-final second-leg home defeat on April 24.
Serie A announced its findings on Monday and suggested that 90 per cent of the travelling Lazio fans were involved in the chanting.
Editors' Picks
However, the club will not instantly be sanctioned, with the threat of a one-match closure of the Curva Nord section of their Stadio Olimpico stadium suspended for a year.