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On Spain national team, Sergio Busquets started on Spain Under-21 on October 2008 in their 2009 UEFA European Under-21 Football Championship qualification play-offs first leg match, against Switzerland. For senior squad he called by Vincente Del Bosque when La Furia Roja against Turkey on 1 April 2009, in a 2010 FIFA World Cup qualifier. He replaced midfielder role naturalized Brazilian Marcos Senna on previously had in the conquest of UEFA Euro 2008. Until now Busquets collected 37 caps in Spain national team.
Sergio Busquets use number 16 in Spain home jersey. As home La Furia Roja use a red jersey with yellow trim, accompanied by dark blue shorts. Designed by a team led by Daniel Newlan at Adidas and the material is still 100% polyester.