The Serbian striker has scored 12 goals in 15 appearances this season but is not willing to extend his contract expiring in 2023 and Commisso blames his agents for that.
“In America, agents take a slice of their clients’ salaries. They don’t weigh on the transfers,” he told Radio 24.
“I don’t want to say I’ve been blackmailed, it’s a strong word, but I’ve been held in check by those who want to move Vlahovic at all costs, as it happened with Donnarumma. With [Gennaro] Gattuso, his agent [Jorge Mendes] represented him, Porto and a player we wanted to sign.
“If it wasn’t for me, Vlahovic would not have the chance to become a king here in Florence.”
Juventus are among the clubs interested in signing the 21-year-old, but Commisso doubts the Bianconeri can afford him.
“I want to tell everyone that Vlahovic belongs to Fiorentina, so they have to talk to us before calling their agents. It’s not a closed chapter. I was criticised when I said he would not renew, but his numbers have improved since.
“The boy is a serious professional, but I don’t want to be blackmailed by anyone.
“I don’t know if Juventus can afford him. I’ve heard that they made capital gains, but they still have millions of debts. How is it possible? Over the last period, they lost €1 billion in the stock market.”
Fiorentina sit sixth in the Serie A table, seven points behind fourth-placed Atalanta.
“It’s one of the best starts of the last few years,” Commisso said.
“Italiano has brought enthusiasm and increased the value of players who were already in the team. His humility has impressed me, Barone and Pradé deserve the praise for getting him.”