Members of the shareholder pact of Mediobanca, which is the top investor in Italy's biggest insurer Generali, have until the end of September to take a decision on whether they wish to exit the pact or not.
Shareholders in the pact hold a combined 28.5 percent stake in Mediobanca.
UniCredit declined to comment.
(Reporting by Gianluca Semeraro, writing by Stephen Jewkes; editing by Agnieszka Flak)