Fiorentina sporting director Pantaleo Corvino has labelled Adrian Mutu a "child" after the striker tested positive for a banned substance.
The Italian Olympic Committee announced last week that Mutu twice tested positive for anti-obesity drug sibutramine and the 31-year-old could now face a lengthy ban.
The former Chelsea star, who was sacked by the Premier League giants in 2004 after testing positive for cocaine, has been temporarily banned by the Italian football league as he awaits the outcome of his B sample.
The Romania international's actions have forced Fiorentina to move in the transfer market to reinforce their attacking line.
Corvino said to Rai Radio: "The club owners, the coach and the team are all upset.
"Everything is linked with a banal mistake.
"Mutu is still a child and has done something stupid.
"On the pitch he is a champion but outside it he hasn't understood that at 30 years old he needs to act with sense."
After being axed by Chelsea and serving a seven-month worldwide football suspension, Mutu joined Juventus in January 2005 before moving to Fiorentina at the end of the following season.
Mutu is under contract with the Viola until June 2012 and has struck four goals in 11 league appearances for Fiorentina.