Hailing from Algiers, Algeria, Slimani started playing football for WBAB from Ain Benian. In 2008 he was playing in Algeria's 3rd Division for JSM Chéraga and, the following season he arrived at CR Belouizdad to play in his country's first division. Having been elected the Best Algerian and Magrebe player in 2013, he was signed by Sporting CP and his career took off to new heights. It was whilst playing for the Lions that he made his debut in the Champions League, won a Portuguese Cup as well as a Portuguese Supercup and scored 57 goals in his first stay at the club.
He was signed by Leicester in 2016 and, from 2018 onwards, had several loan stints. After Newcastle United, Fenerbahçe SK and AS Monaco, he played with french club Lyon where he remained until the last day of this January transfer window. An extremely hard worker, Slimani also has a distinguished career with Algeria's national team with whom he made his debut in 2013 and scored 40 goals for, making him Algeria's all-time highest scorer. Having won the African Nations Cup in 2019, he was also called up to another 4 of these tournaments as well the 2014 World Cup in Brazil.
Back at Sporting CP he said that it was an easy decision to come to the club he calls home and said that it was whilst wearing the green and white hoops that he felt at his happiest. He hopes to score many more goals with the Lions' jersey and believes he is now more experienced in comparison to his first stay with the club.