Negotiations were confirmed to be in the final stages yesterday and this evening Massimo Moratti left the club headquarters with director Marco Branca.
"We have reached a deal with Benitez," the President told Sky Sport 24 Italia.
"Tomorrow we'll announce the date and time of the presentation Press conference."
The Spaniard is a free agent after terminating his contract with Liverpool by mutual consent.
"We finalised the last details, which were not all that important anyway. All we are waiting for is his signature and it's all done."