Tottenham Hotspur's 26 year old Cameroon international defender Sebastien Bassong signed for Norwich on 21st August 2012. The fee has been reported as being £4m which would makehim Norwich's record signing. He signed a three year contract with the Canaries.

Although born in France, his parents are from Cameroon. He was a graduate of the Clairefontaine academy and he played 87 appearances for FC Metz between 2005 and 2008. He was capped twice by the French Under-21 side before playing for Cameroon in 2009.

In July 2008, Newcastle paid £500,000 for his services. He made his professional debut for Newcastle on 26 August in a League Cup game away to Coventry City, before playing his first league game for Newcastle away to Arsenal. He made 30 appearances for Newcastle and was named the club’s player of the season for the 2008–09 season.

Following their relegation to the Championship in May 2009, he expressed his desire to leave the club, with Manchester City, Arsenal and Tottenham Hotspur linked with him. On 6th August 2009, it was confirmed that he had passed a medical at Spurs signing a five-year deal and completed an £8 million move to them. He made 38 appearances in his first season but lost his place in 2010/11 and 2011/12

On 31st January 2012, Bassong joined fellow Premier League side Wolverhampton Wanderers on loan until the end of the season. He made 9 appearances for Wolves.

Bassong made his Norwich debut in the 1-1 draw with QPR on 25th August 2012.

He scored his first goal for the club in the 1-1 draw at Everton on but this was marred by racial comments made against him on Twitter. His third goal for Norwich (away to Swansea in a game won 4-3 by Norwich) was also marred by a Swansea fan making a racial gesture. South Wales Police said a 23-year-old Swansea man had been released after questioning on suspicion of a racially aggravated public order offence. The incident allegedly happened after Robert Snodgrass scored the visitors' fourth goal in the 77th minute in a match Swansea lost 4-3.Cameroon international Bassong indicated to referee Howard Webb that he had been the victim of a racist gesture as he celebrated the goal with his teammates. Webb referred the complaint to the fourth official and a male fan was then arrested.

Impressive form in the Norwich defence saw Bassong recalled to the Cameroon international squad in March 2013 for their World Cup qualifier against Togo. Bassong had not played for his country since the 2010 World Cup.

Bassong made 35 appearances in his first season with Norwich, scoring three goals, as the Canaries finished 11th in the Premier League. He was voted the Player of the Season.

He made thirty appearances in the 2013/14 season in which Norwich were relegated from the Premier League.

Out of favour under new manager Neil Adams, he was linked with a move to Crystal Palace at the end of August 2014. On 8th October 2014, he joined Watford on a 93 day loan. "It's important for Seb to get some first-team football and keep himself fit and involved," said Adams. "This is a good short-term loan move for all parties involved."

Bassong made 11 appearances for the Hornets before returning to Carrow Road in mid-January and was offered an olive branch by new Norwich manager Alex Neil. Bassong went on to make 21 appearances including playing in the 2-0 Championship Play-off final victory over Middlesbrough on 25th May 2015.

Bassong made 35 appearances for City in 2015/16, scoring twice, as the Canaries were relegated from the Premier League.

On 2nd May 2017, Norwich City announced that they would not be renewing the contracts of seven senior players in the summer including Bassong. He had made just 13 appearances during 2016/17 bringing his career total for Norwich to 135. He was linked on 21st May 2017 with a move to Turkish side Bursapor according to Turkish daily sport newspaper Fanatik.

On 22nd August 2017, Birmingham City manager Harry Redknapp confirmed that Bassong was training with the Blues and hinted a deal could be on offer. Bassong, who played for Redknapp at Spurs, had been invited to use Blues’ Wast Hills facilities in a bid to improve his fitness and the manager says the Cameroonian could solve his defensive problem. “Seb played for me, he’s a great lad and he’s going to come in and get himself fit ready to play somewhere. He’s on a free, he’s a good lad and a good player who played for me at Tottenham. He was player of the year at Norwich two years ago and he’s still a very good player in my opinion.”

In August 2018 he trained with QPR and was on the substitutes bench for their Under-23 match against Notts Forest on 20th August 2018.

On 25th October 2018, Bassong signed for Peterborough until the end of January 2019. He made just one appearance for the Posh.

On 25th July 2019, Bassong signed for Greek side Volos who recently gained promotion to the Greek Super League after finishing champions of the country's second tier league last season.

An interview with the Pink Un in early January 2020 revealed that Bassong had left Volos and that he was looking for a new team. He had played three games for Volos.

In September 2020 he appeared for non-league Haringey Borough, who play at step three of non-league in the Isthmian Premier Division, as they lost a friendly 3-1 to Hanwell Town.