On-loan with Celtic, Guidetti comes off contract at City in June and admits he has family in Rome.
"Lazio? I never got an offer but my relatives would be happy. Some are still living in Italy, close to Prenestina," said the Swede.
"The team I have been closest to was Sampdoria.
"At 15 I trained with them, in the Primavera and once with the first team."