Ouaddou was born in Alnif, Morocco. He started his footballing career quite late, at the age of 21. In the summer of 2001, Ouaddou was signed by newly promoted Premier League club Fulham for £2 million, on a four-year contract. However, Ouaddou did not settle in England and spent the last two years of his contract on loan at Rennes, before joining the French club permanently once his contract expired. On the Summer of 2006, he signed for Olympiacos FC. After disappointing appearances with the team, Ouaddou was regulated on the bench. On 7 December 2006 Ouaddou asked Olympiacos to release him free because he felt homesick and had some family problems. The club's directors agreed and Ouaddou will return to France. On 1 January 2007, the opening day of the January transfer window, Ouaddou joined Valenciennes FC on a free transfer. After one season with the club however, he transferred to AS Nancy for a fee of £150,000. He was voted the club's best signing for the 2008–09 campaign. On 30 June 2010, Abdeslam Ouaddou left AS Nancy after a dispute with the Ligue 1 outfit. The Moroccan veteran defender had a deal until 2012 but has left after the club decided to sack him for gross misconduct, while the player wanted to cancel his contract. In 2010, he played for Al-Duhail SC in the Qatar Stars League, eventually winning the league championship. It was announced on 8 August 2011, that Qatar SC had signed him for a two-year deal. He commented on the move, stating "I'm more than pleased to have extended my stay in the Qatar Stars League and move to another big club". In 2013, he criticized employment conditions in Qatar, stating "When you work in Qatar you belong to someone. You are not free. You are a slave." In November 2012, he left Qatar SC. On 1 January 2013, he signed a contract with his first professional club AS Nancy to close his career, but two weeks later he announced that he retired from professional football.
International career
Between 2000 and 2009, Alnif made 58 appearances for the Morocco national team scoring 3 goals.
