The 24-year-old is unconcerned by rumors linking the Catalan giants with another central midfielder, despite the potential threat of increased competition for places
The Cameroon international has yet to start talks with the Gunners about a new contract, despite having just two years left on his current deal, and his performances at the Emirates Stadium have reportedly attracted the advances of the Blaugrana.
When asked for his opinion of the African, Busquets told ESPN: "Song is a very good player - young, a hard worker, with lots of physical power," he said.
Barcelona is believed to be keen on replacing Seydou Keita, who decided to leave the club at the end of last season to join Chinese club Dalian Aerbin.
Tito Villanova's side starts its Liga campaign against Real Sociedad on Aug. 19.