The defensive midfielder is a reported transfer target for the Catalan club and Iniesta admits that he is impressed by Song's abilities.
"Technically he is a very good player and is also very strong physically too," Iniesta said. "I know Song from seeing him play, and from playing against him.
"If he comes it would be because he has the qualities to play here, there is little doubt about that, and we'd welcome him."
Recent reports have suggested that Barcelona could offer £15m for the 24-year-old.