The former Olympiakos midfielder has agreed to join the Serie A club on a temporary basis with an option to buy after two-and-a-half years at the Estadio do Dragao.
Porto midfielder Fernando Belluschi has confirmed that he has agreed a loan move to Genoa.
The Argentine's transfer to the Stadio Luigi Ferraris had appeared to hit an impasse on Sunday after Genoa president Enrico Preziosi admitted that the club was still deciding between signing the 28-year-old and Juventus' Michele Pazienza.
"I am really happy to be here," Belluschi told Primocanale Sport upon arriving in Italy. "It would be great to reach a European place with Genoa."
The former Olympiakos star will join the Italians on a six-month loan deal, with the Serie A side keeping the option to buy half of his playing rights, the percentage which Porto owns, for 5 million euros in June.
Questioned about fellow countryman Rodrigo Palacio, one of his new teammates, Belluschi said: "I have not yet spoken to him.
"He is a great player and I am happy to find him at Genoa."