A fire bomber has attacked a restaurant co-owned by Christian Vieri in protest at the Inter Milan striker's attitude.
Vieri played in Inter's 3-2 derby defeat by AC Milan
The perpetrator left a message saying: "Vieri, the tolerance is over, you are not worthy of Inter.
"You don't deserve the support of our city because you don't care about our suffering and that we are disgraced by you. Now you start to pay."
The attack came three days after Inter threw away a two-goal advantage to lose 3-2 to city rivals AC Milan in Serie A.
Devices made from bottles damaged a wall and the sign outside the restaurant Baci & Abbracci.
It is jointly owned by Vieri and former Inter midfielder Cristian Brocchi, who now plays for AC Milan.
A similar attack, also on Tuesday, was made on a restaurant in Milan previously part-owned by Inter defender Fabio Cannavaro.
Inter condemned what it called the "unspeakable" attacks in a statement on the club website.
"We refuse to consider these the actions of true Inter fans," the statement said.
"We regret what has happened and that these gestures were directed at our footballers, for whom we guarantee maximum security."
Vieri is Inter's top scorer this season - and fourth in Serie A - with 11 goals.