safc.com profiles three of the 20 players to play for both the Blues and the Black Cats.Bryan ‘Pop’ Robson
Sunderland-born forward Pop Robson had three spells with his hometown club during his playing career, scoring 67 goals in 174 appearances.
He began his career with Newcastle United before joining West Ham United in 1971 where he would spend three seasons before the Black Cats parted with £145,000 for his services.
Bryan spent just two years with the club before returning to the Hammers, though he would return for a second stint on Wearside in 1979.
Two years later and he left for Carlisle United before moving to Chelsea in a player-coach capacity in August 1982.
Robson spent just a year at Stamford Bridge, scoring five goals in 22 appearances including the only goal of the game on his debut as the Blues defeated Cambridge United 1-0.
He returned to Sunderland in 1983 as player-coach before holding coaching and scouting roles on Wearside as well as at Hartlepool, Carlisle, Chelsea and Manchester United.
Tore Andre Flo
Norwegian striker Tore Andre Flo made his bow in British football with Chelsea when he signed for the West London outfit in 1997.
After impressing for Sogndal, Tromso and Brann in his native Norway, Ruud Gullit brought Flo to Chelsea and the tall frontman would go on to win five trophies in four seasons at Stamford Bridge.
In total, Flo made 163 appearances for the Blues and scored 50 goals before moving to Rangers in 2000 for a reported fee of £12million – the highest ever fee paid for a Norwegian.
Flo scored 35 goals in 68 games for the Scottish outfit before moving to Sunderland ahead of the 2002-03 campaign.
Unfortunately, Sunderland were relegated during the Norwegian’s debut campaign on Wearside and he would return just six goals in 32 games over the course of the season.
Spells with Siena, Valerenga, Leeds United, MK Dons and a return to Sogndal followed before Flo retired in 2012.
Flo is now back with Chelsea on the Blues’ coaching staff.
A product of Southampton’s successful academy system, Former England international Wayne Bridge spent six seasons at Stamford Bridge after moving from the Hampshire-club in 2003.
In five years with the Saints, Bridge made 173 appearances before moving to Chelsea for a reported £7million with Graeme Le Saux going the other way.
In six seasons in South London, Bridge won all three of the major domestic trophies in the Barclays Premier League, the FA Cup and also the League Cup.
He made 142 appearances for the Blues before joining Manchester City in 2008 for a reported fee of £10million.
Whilst with City, Bridge spent time on loan at West Ham before joining for a brief spell at the end of the 2011-12 campaign.
The Southampton-born full back made ten appearances for the Black Cats before returning to City.
Bridge spent last season on loan at Gus Poyet’s Brighton before moving to Championship outfit Reading ahead of the 2013-14 campaign on a permanent deal.