The president of the Italian Football Federation (FIGC), Gabriele Gravina, says the game has lost its appeal because of racism and financial issues.
Serie A said in a statement that "a significant percent" of supporters in the stand in question were heard abusing AC Milan's Franck Kessie.
"Thank you from the bottom of my heart to everyone for your prayers and your thoughts," Ospina wrote on Twitter.
All signs were pointing to a big Milan derby win over Inter, but Luciano Spalletti's side showed their quality. PLUS: A word on magical Messi.
No one gave Inter much of a prayer in the Milan derby on Sunday, but they stepped it up a gear to do the double for the first time since 2012.
Inter Milan moved to third place in Serie A with a 3-2 victory over AC Milan in a scintillating Derby della Madonnina on Sunday.
David Ospina suffered an injury on five minutes after clashing with Udinese winger Ignacio Pussetto but played on until he collapses on 42 minutes.
Stefano Sturaro and Goran Pandev scored the goals as Genoa beat Juventus 2-0, with Paulo Dybala's finish for the visitors overturned by VAR.
Claudio Ranieri's AS Roma side suffered a blow to their top-four hopes in Serie A as they went down to a surprise 2-1 defeat at struggling SPAL.