Later scholars such as John W. Haeger argued the Marco Polo might not have visited Southern China due to the lack of details in his description of southern Chinese cities compared to northern ones , while Herbert Franke also raised the possibility that Marco Polo might not have been to China at all , and wondered if he might have based his accounts on Persian sources due to Polo 's use of Persian expressions .
Marco Polo had a tendency of using the Persian version of Chinese names .