Roma striker Luca Toni has voiced his surprise at the news of Adrian Mutu's latest doping controversy.
Toni's former team-mate at Fiorentina twice tested positive last month for anti-obesity drug sibutramine.
Mutu is temporarily suspended and could face a lengthy ban.
"It is inexplicable," said Toni to Italian newspaper Il Messaggero."It's incredible.
"He has no reason to lose weight and I ask myself how come he took that drug.
"It's stupid to throw away everything just like that.
"We know there are anti-doping controls done and that we cannot take anything that is banned.
"It's like going at 150km against a wall, you may escape unharmed but the likelihood is that you risk getting hurt."
Romania international Mutu served a seven-month ban five years ago and was sacked by Chelsea after testing positive for cocaine.
He is under contract with Fiorentina until June 2012 and has scored four goals in 11 league appearances this season.