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In 1990, before Wimbledon had moved out of their ground to groundshare at Selhurst Park with local rivals Crystal Palace, Hammam bought out a covenant held on the ground by the Council that required it to be retained for sporting use.
Hammam purchased control of Cardiff City F.C. at the end of 2000, where he picked up where he left off with Wimbledon. After taking over at Cardiff, Hammam controversially pledged to get the entire Welsh nation to support Cardiff by renaming the club "The Cardiff Celts" and changing the club colours to green, red and white.,
At Cardiff he became a cult-hero with fans for taking part in their head-patting 'do the Ayatollah' chant. One such game saw him performing the celebration during an infamous 2-1 home win in the FA Cup against then-Premier League side Leeds United in 2002. This, along with other aspects of his behaviour during the match, was blamed for contributing to the subsequent violence between Leeds and Cardiff fans at the end of the match.
After failing to get the new stadium plans agreed by Cardiff Council due to concerns over financial security in 2006, Hammam agreed to a takeover by a consortium led by new chairman Peter Ridsdale and including local businessman Paul Guy. In March 2008, Cardiff City began a court case against financial backers Langston over the repayment of a loan believed to be worth around £31 million. During the hearing the barrister representing the club named Sam Hammam as the man they believe to be behind the company. No settlement was reached in the case.
In July 2013, following Cardiff City's promotion to the Premier League, it emerged that Malaysian businessman Vincent Tan, who had taken effective control of the club in 2010, was in advanced talks with Hammam - confirmed as Langston's spokesman - about repayment of the loan, then thought to be around £24 million. Four days later, on 18 July 2013, Tan announced that an "amicable resolution" had been reached between Cardiff City and Langston over the debt issue, with Sam Hammam becoming a life president of the club. Hammam confirmed this in an interview with the BBC on 24 July, requesting that fans of the club back the Malaysian owner.
Hammam has achieved a level of notoriety in English football for his unusual antics at matches, frequently walking around the pitchside during games, and his eccentric methods of publicising himself and his players. On at least one occasion he made a player eat sheep's testicles prior to signing with Cardiff City.
- Borras, Kevin; Slater, Matt (1996-10-17). "All for one!". Match of the Day magazine (10) (BBC). pp. pp10–13
- "Sam Hammam urges Cardiff FC fans to back Vincent Tan"BBCRetrieved on 17 August 2013,
- "The Guardian: Still crazy"
- "WISA article on lifting of Plough Lane covenant" Retrieved on 23 December 2011.
- BBC Wales: Hammam: 'I will die for Cardiff Celts'
- BBC Wales: Fans are Hammam's big worry
- "Cardiff supremo rejects mayham claims", The Scotsman Retrieved on 6 December 2008
- "Hammam named in Cardiff loan case" BBC Retrieved on 14 March 2008,
- "Vincent Tan: Cardiff City could be debt-free in 'days'" BBC Retrieved on 17 August 2013,
- "Cardiff City: Tan & Langston reach "amicable resolution"" BBC Retrieved on 17 August 2013,
- "Sam Hammam urges Cardiff FC fans to back Vincent Tan"BBC Retrieved on 17 August 2013,
- http://news.bbc.co.uk/sport1/hi/football/teams/c/cardiff_city/1411563.stm BBC Sport:Prior moves to Cardiff 28th June 2001
|Cardiff City F.C. chairman
2000 – 2006