The French shot-stopper believes that his side will have to work hard to come out on top of Sunday's game and praised the Nerazzurri for his spell at the club
The 32-year-old custodian plied his trade at San Siro between 1998 and 2001 before choosing to further his career at Parma.
As Frey prepares to lock horns with his former club, the French goalkeeper only had words of praise for the Nerazzurri.
"Inter are the club who brought me to Italy, I can only be grateful to them," he told a press conference.
"I also hold president Massimo Moratti in great esteem.
"Inter have it written in their name: they are a club where foreigners have always been important and who helped bring success in the last few years."
Inter head into Sunday's game on the back of a poor run of form and a coaching change, but Frey insists that Genoa will approach this game with the greatest care.
"This will be a complicated match," he said. "We will have to give our best."