Fiorentina fear losing Stevan Jovetic in January to Chelsea.
Florence sources say Chelsea have intensified their interest in the Montenegro international since the summer market shut, having the fit-again forward scouted in club and international action.
A Fiorentina official revealed a bid from Arsenal was rejected on transfer deadline day last month.
However, it's now understood Chelsea are pushing hard for the attacker and Fiorentina are bracing for a January battle to keep hold of their young talisman.
