Mario Balotelli has sparked anger after posting a picture of himself with a gun on Instagram.
The Italian striker pointed the gun at the camera with the message "a big kiss to all the haters".
Balotelli later deleted the photo.
The incident is the latest controversy in the 23-year-old's career.
During his time at Manchester City, Balotelli reportedly threw a dart at a youth-team player, set a firework off in his home and was involved in bust-ups with then-manager Roberto Mancini and team mates.
The striker has been heavily criticised in the wake of Italy's disappointing World Cup campaign, leading to suggestions he could leave AC Milan this summer.