We take a look at the links between the two clubs ahead of Saturday's Premier League clash...
Allison made all but two of his playing appearances with West Ham, turning out 238 times in a six year career tragically cut short by tuberculosis.
He had already begun to hone his managerial skills by working with the Hammers’ younger players, and arrived at City as Joe Mercer’s assistant in 1965.
In a glorious period for the club, Big Mal was one flamboyant half of the managerial duo that delivered four major trophies to Maine Road in three years.
Northern Ireland international Kevin Horlock represented City across three divisions during a six year spell with the club.
The most famous of his 44 goals in sky blue came in 1999, when the midfielder scored the first goal for City in a remarkable comeback in the play-off final against Gillingham.
He moved to West Ham in 2003 but only lasted a season and 27 league appearances before falling out of favour with manager Alan Pardew and departing for Ipswich.
Read this week's guest blog from Kevin here.
Marc Vivien Foe
Cameroonian midfielder Marc Vivien Foe was the scorer of City’s last ever goal at Maine Road in April 2003.
Foe had previously registered 38 appearances for West Ham in an 18 month period, before moving on to Lyon in 2000.
He arrived at City on loan from the French side and wrote himself into the history books with his strike against Sunderland before dying tragically while playing for Cameroon in June 2003.
A member of the Israeli Football Hall of Fame, Eyal Berkovic was an instant hit at West Ham – grabbing the winning goal against London rivals Spurs on his debut.
Berkovic also scored on his City debut in 2001 against Watford, although the most famous of his goals in three years at City came against Ipswich in the FA Cup in 2002.
In 2009 he was named the tenth greatest midfielder ever to play in the Premier League by the Times.
Famously scooping Premier League winners’ medals on both sides of Manchester, Carlos Tevez has also lifted the FA Cup in City sky blue and grabbed 53 league goals since his switch from Manchester United in 2009.
Before all that he was a Hammers hero, making 29 appearances in his solitary season at Upton Park and claiming a permanent place in supporters’ hearts by scoring the winner at Old Trafford on the final day of the 2006-07 season to save West Ham from relegation.
Lomas made his name as a midfielder with City, spending six years at Maine Road in the 1990s.
He suffered relegation with the Blues in 1996, and was unfortunate to score the own goal against Liverpool which effectively condemned his side to the drop.
The Northern Ireland international left for West Ham in 1997 and played 227 times in claret and blue, was appointed captain and won the Intertoto Cup in 1999.
Rejected by Derby County as a teenager, Trevor Morley signed for City in January 1988 and racked up 72 appearances in a two year career with the Blues.
The striker netted 18 times, including a crucial equaliser against Bradford on the last day of the 1988-89 season which sealed City’s promotion to the First Division.
Unfancied by new boss Howard Kendall, Morley headed south to Upton Park where he finished as the Hammers’ top scorer in the 1990-91 season.
Costa Rican striker Paulo Wanchope formed a deadly partnership with Paulo Di Canio that brought West Ham 31 league goals during his solitary season at Upton Park.
Pitching up at City in 2000, Wanchope had a formidable scoring record for the Blues, netting 27 times in just 64 appearances. Perhaps his most valuable strike was the winner against Newcastle which effectively saved the club from the drop in 2004.
He has now begun a managerial career in Costa Rica.
Sandwiched between two spells as a City player, Ian Bishop turned out 255 times for West Ham and enjoyed cult hero status.
City fans were also keen on the midfielder who made 24 appearances for the club in 1989 before he was sold by Howard Kendall as part of the deal which saw Mark Ward arrive at Maine Road.
Returning in 1998, Bishop experienced promotion and relegation with the Blues before heading to the USA in 2001 to sign for Miami Fusion.
A lengthy playing career at Upton Park saw John Bond play 444 times for the Hammers in 16 years.
A right back who managed 37 goals for the club, he was part of the side that clinched the Second Division title in 1958 and won the FA Cup in 1964.
Essex-born Bond took over as City manager from another former West Ham man, Malcolm Allison, in 1981 and guided the side to the FA Cup final in his first season at Maine Road.