By ESPNSTAR.com staff
Simplicio joined the Giallorossi in the summer of 2010 and initially established himself as a key player at the Stadio Olimpico.
However, his influence gradually declined last season and Roma terminated the remaining year of his contract by mutual consent, paving the way for him to move to Japan's top flight.
Cerezo are currently 15th in the J.League and are just two points above the relegation zone, and Simplicio admits he is aware of the challenges that await him at the Nagai Ball Gall Field.
"I understand that the club [are] in a tough situation," the 32-year-old said in an official club release.
"That's why I want to play my best and contribute to Cerezo as quickly as possible."
Sergio Soares' men have already lost key midfield duo Hiroshi Kiyotake and Kim Bo-kyung to Nuremberg and Cardiff City respectively this summer, and are currently without Takihiro Ogihara and Hotaru Yamaguchi, who are represting Japan at the London Olympics.
Simplicio first moved to the Serie A in 2004 when he joined Parma and spent two season there before moving to Palermo, where he went on to score 21 goals in 129 league appearances.