The Montenegrin front-man is wanted by Arsenal, Manchester City and Juventus - but he has insisted he is looking at finishing the season with Fiorentina before deciding his future.
But Jovetic has struggled for form in recent weeks and has not scored since the end of March - which has led to some criticism on the terraces.
And Toni feels this will have an adverse effect on Jovetic.
"Stevan feels the Fiorentina fans treat him without love," Toni told a press conference.
"Everybody says that the player's struggles will end when he starts scoring again.
"The way I see it in this difficult period is that Jovetic is only supported when he is making a difference on the field. At the moment, there is no enthusiasm towards him - he does not feel loved."