We profile a trio who've played for both clubs.
MICHAEL TURNER (SAFC 2009-12, NCFC 2012- )
After a youth career at Charlton Athletic that included a brief spell at Inter Milan, Turner made permanent moves to Brentford and Hull City before arriving at the Stadium of Light in 2009. The tall defender made his Black Cats debut against his former side Hull and made over 30 appearances for Sunderland in his debut campaign for the club. Turner found his options limited due to injuries the following season but played almost 30 times in the 2011-12 campaign. Turner signed a two-year contract with Norwich in the summer and made his Canaries debut in the opening-day defeat to Fulham.
DICKSON ETUHU (NCFC 2005-07, SAFC 2007-08)
Nigerian international Etuhu initially signed for Norwich on loan from Preston in 2005 before making the move permanent the following season. The strong midfielder went on to make over 50 appearances in his two seasons in the Championship at Carrow Road before making the switch to the top flight with the Black Cats in 2007. Etuhu played one season under Roy Keane, grabbing a single goal against Wigan before signing for Fulham in the summer of 2008. Etuhu has 17 full international caps for Nigeria, representing his country at the 2008 African Cup of Nations and the 2010 FIFA World Cup.
CARL ROBINSON (SAFC 2004-06, NCFC 2006-07)
After spending his formative years at Wolves, Robinson joined Sunderland on loan in 2004 and made the move permanent later that year. He collected a Championship winner's medal in 2005, playing 42 of the 46 league games on the way to the title under Mick McCarthy. Robinson made fleeting appearances at the beginning of the 2005-06 Premier League season for the Black Cats, and moved to Norwich on loan towards the end of 2005, securing a permanent deal in January 2006. The combative midfielder racked up over 50 appearances for the Canaries before deciding to switch to Canadian side Toronto FC in January 2007.