1. Deco: the Portuguese midfielder played for Barcelona football club from 2004 to 2008 before moving to Chelsea football club.
2. Juliano Belletti: the defender played for Barcelona FC between 2004 and 2007. He later moved to Chelsea in 2007.
3. Samuel Eto’o: unlike Deco and Belletti, Samuel Eto did not join Chelsea FC directly from Barcelona. He played for Barcelona FC from 2004 to 2009. He later played for Chelsea in the 2013/2014 season.
4. Andreas Christensen: the Danish defender rose from the Chelsea academy and became a regular in the team. He left Chelsea in the summer of 2022 to join Barcelona football club.
5. Ricardo Quaresma: the Portuguese winger played for Barcelona from 2002 to 2003. He later played for Chelsea in 2009 when he joined the Blues from Inter Milan on loan.