The left-back, who can also play in central defence, is reported to be high on Roberto Mancini's wish-list, although he sees him firmly as a centre-half.
The 26-year-old's agent, though, feels that Radu is being priced out of a move by Lazio.
"I have a very good relationship with the City officials," Victor Becali told prosport.ro.
"The boy is very appreciated by the manager and the staff. The idea is to have him play in the centre of the defence, next to [Matija] Nastasic. However, Claudio Lotito [Lazio president] asks 16-17 million euros for him."