Foreign minister Antonio Tajani tweeted solidarity with Italian police after violent clashes with Eintracht Frankfurt fans in central Naples before the German team's Champions League match against Napoli on Wednesday.
"My solidarity to the forces of law and order and to the city of Naples for these very series episodes of violence," read the tweet.
"The ban on ticket purchases by Eintracht Frankfurt supporters was not a discriminatory act. I hope these criminals are brought to justice," the tweet added.
A police car and other vehicles were set on fire, car windows were smashed and fans hurled flares, smoke bombs, chairs and other objects as terrified bystanders took refuge in bars and restaurants during Wednesday's violence.
The visiting Eintracht Frankfurt fans also hurled stones and bottles at buses transporting Napoli hardcore fans or 'ultras' before riot police responded with tear gas to quell the violence.
Germany's foreign minister Nancy Faeser also deplored Wednesday's clashes, tweeting: "Violence and hooligans destroy sport."
The Eintracht Frankfurt fans travelled to Naples despite being barred from Wednesday's Champions League last-16 match with Napoli after incidents during the first leg in Germany last month.