|Date of birth||14 August 1967|
|Place of birth||Lagos, Nigeria|
|Height||1.80 m (5 ft 11 in)|
|*Club domestic league appearances and goals|
On 16 August 2019, FIFA banned Siasia from all football activities for life (later reduced to five years), following a match-fixing investigation. The adjudicatory chamber of FIFA’s independent Ethics Committee alleged that the former Nigerian coach is guilty of "bribes in relation to the manipulation of matches in violation of the FIFA Code of Ethics".
At club level, Siasia most notably played for French team FC Nantes where he became league champion in 1994–95. He also played for Australian club Perth Glory with fellow Nigerian Peter Anosike, as well as in Belgium, Portugal, Saudi Arabia and Israel.
He played 51 international matches for Nigeria, in which he scored thirteen goals, and was part of the team that participated in the 1994 FIFA World Cup and won the 1994 African Nations Cup. He was also a member of the Nigerian team that won bronze at 1992 African Nations Cup in Senegal. He participated in the national team over a period of 11 years and was recognized in Nigeria as the third leading scorer for the national team.
In 2005, Samson Siasia coached the under 20 team (Flying Eagles), taking them to the finals of both the 2005 Under-20 World Cup and the U-20 African Youth Championship. He won the African Youth Championship and advanced all the way to the world final – before losing to Argentina 2–1. He also assisted Augustine Eguavoen in coaching the national team.
Samson Siasia was appointed national U-23 coach in January 2007. In 2008, he coached the Nigerian Under-23 Olympic squad to the final against Argentina. In a superbly played series of matches, Nigeria's team earned the Olympic Silver Medals. Earlier in 2008, the U-23 team won the inaugural Intercontinental Cup in Malaysia. This team was composed entirely of domestic Nigerian players and won the Cup against many teams headed for the 2008 Summer Olympics. In addition to his position as head coach of the Under 23 Olympic Eagles, he developed a youth academy in the capital city Abuja, called SiaOne Soccer Academy. On 17 March 2009, he was reappointed as the head coach of the under-20 team after the finished a disappointing 3rd in the 2009 African Youth Championship. He received a six-month contract to coach Heartland F.C. in July 2010. On 4 November 2010, he was named as the national team coach to succeed Swedish Lars Lagerbäck. He was fired on 28 October 2011 for failing to take the Nigeria team to the 2012 African Nations Cup in Gabon & Equatorial Guinea.
Siasia was one of the five foreign managers auctioned in February 2012 for the new Bengal Premier League Soccer. His former national teammate, Jay-Jay Okocha, was bought by the same club from the five icon players up for auction. On 26 February 2016, he was named by the Nigeria Football Federation (NFF) as the Chief Coach of the Nigeria national team, the Super Eagles, to be assisted by Salisu Yusuf, Emmanuel Amunike and Alloysius Agu after the resignation of Sunday Oliseh from the position.
In August 2019 he was handed a lifetime ban by FIFA related to match fixing. He said he would appeal but was in no rush to do so. In June 2021, Siasia's appeal at the Court of Arbitration for Sport earned him a reduction of the suspension to five years and the cancellation of the additional fine of 50,000 Swiss francs ($54,000).
- "Samson Siaisa fired as Nigeria coach". BBC Sport. 28 October 2011. Retrieved 12 February 2013.
- "Siasia life-ban reduced to five years by Cas". BBC Sport. Retrieved 18 March 2022.
- "FIFA ban former Nigerian coach Siasia over match fixing". Reuters. Retrieved 16 August 2019.
- Record at FIFA Tournaments – FIFA
- http://allafrica.com/stories/200911091121.html Bayelsa UTD Boss Lauds Gov. Sylva (allAfrica.com)
- Siasia joins Heartland.[permanent dead link]
- Sunday Oliseh quits as Nigeria coach over contract violations, Oluwashina Okeleji, BBC, 26 February 2016
- "Siasia names Mikel, 17 others for Rio 2016". www.pulse.ng. 22 July 2016.
- Oluwashina Okeleji (14 February 2017). "Samson Siasia and Winfried Schafer on Rwanda coach shortlist". BBC Sport. Retrieved 15 February 2017.
- Oluwashina Okeleji (23 April 2018). "77 applicants for vacant Cameroon coaching position". BBC Sport. Retrieved 27 August 2019.
- "Former Nigeria great Samson Siasia handed life ban by Fifa". BBC Sport. 16 August 2019. Retrieved 27 August 2019.
- Oluwashina Okeleji (17 August 2019). "Samson Siasia: Ex-Nigeria coach in no rush to appeal life ban". BBC Sport. Retrieved 27 August 2019.
- AFP (21 June 2021). "CAS reduces match-fixing ban for Samson Siasia". The Guardian News. Retrieved 15 December 2021.
- Official Web Site of Samson Siasia at SiaOne.com
- Official Web Site of SiaOne Soccer Academy at SiaOne.com
- Samson Siasia at National-Football-Teams.com