MILAN (Reuters) - Italy's market watchdog Consob will summon top executives at bank Intesa Sanpaolo (>> Intesa Sanpaolo SpA) and insurer Assicurazioni Generali (>> Assicurazioni Generali SpA) in the next two days, a source close to the matter told Reuters on Tuesday.

The source added the authority might also summon UniCredit  (>> UniCredit SpA), the biggest shareholder in investment bank Mediobanca (>> Mediobanca Group) which is in turn the top investor in Generali.

Intesa Sanpaolo is considering an all-stock bid for Generali, the country's biggest insurer with a market value of 22 billion euros ($23.65 billion), two sources said on Tuesday, in what would be among the industry's biggest deals in Europe.

Intesa Sanpaolo, Generali and UniCredit were not immediately available for comment. Shares in Generali closed up 8.21 percent on Tuesday.

(Reporting by Silvia Aloisi, writing by Giulia Segreti)