Ranieri's arrival could end Mourinho's strong association with his former club as he's never seen eye to eye with his fellow ex-Chelsea manager.
The pair clashed while Mourinho was in charge of Inter and Ranieri was working for AS Roma.
"So many years in England and has not yet learned to say hello," Mourinho said of his rival. "Maybe when he turns 70 his mentality will change.
"He likes to watch what I do ..."