He helped his uncle at a local market in order to aid his family financially and to also fund his passion for football, as he was part of the Stade Malien academy.

[4] Nimaga's agent was in contact with Albanian champions Skënderbeu Korçë prior to his move to the club, and was convinced by the club's official to return to Europe where he signed his first professional contract in the closing stages of the 2013 January transfer window, which was two-year deal ending on 31 December 2015.

On 14 July 2015, in the first leg of second qualifying round of 2015–16 UEFA Champions League against Crusaders, Nimaga scored the opening goal in the 15th minute for a 4–1 victory.

On 5 November 2015, Nimaga scored a fantastic goal from 40 yards in the 2015–16 UEFA Europa League group stage match against Sporting as teammate Peter Olayinka forced the Sporting goalkeeper Marcelo Boeck into a mistake and Nimaga himself capitalised on woeful defending to score from 40 yards as Skënderbeu recorded a 3–0 win against the Portuguese side at the Elbasan Arena, which was their first ever win at the group stage in any major tournament.

[12] Later on 13th, Nimaga scored his first league goal, a 94th-minute winner against Teuta Durrës in the matchday 6 to help Skënderbeu maintain its 100% winning record.