Fiorentina sporting director Daniele Prade has expressed his disappointment over the club's failure to sign Dimitar Berbatov.
Berbatov's decision sparked a fierce backlash from Fiorentina, but Prade has now described the player as his "biggest regret".
"He said on 28th July he wanted to join Fiorentina, but he changed his mind. He is our biggest regret," he wrote on Twitter.
Berbatov signed a two-year contract with Fulham.