The Brazilian international, who has recently been linked with Roma, joined the R's from Inter Milan in the summer of 2012.
Despite a seven-year association with Inter, Cesar insists that would not stop him from playing for another club in Serie A.
"I played for Inter but this doesn't preclude my return to Italy," the 33-year-old told La Gazzetta dello Sport.
"My agent is working on my future but it's better to talk about it after the Confederations Cup."
Cesar is also thought to have attracted the interest of Arsenal.