Oumarou started his professional career in China with Yanbian[1] before moving to Changsha Ginde where he played in the 2007 and 2008 Chinese Super League.
In the 2009 winter transfer window, Milan Živadinović discovered Oumarou in China and after that, he was sold to the Serbian club Red Star Belgrade.
[3][4] His first match of the 2012–13 season was against Lithuanian club Sūduva on 19 July 2012, in the second qualifying round for UEFA Europa League.
[10] Oumarou has scored his first goal in Partizan on 8 July in a friendly match against Hungarian club Vasas in a 1–4 win.
[11] He made his official debut for the club in a Second qualifying round UEFA Champions League, against Dila Gori on 14 July 2015.
[12] In the second leg of the second qualifying round for the Champions League, Aboubakar Oumarou scored a goal in the victory of his team 0–2.
[13] On 17 September 2015, Oumarou scored twice in a 3–2 home victory over Dutch club AZ in the opening round of the Europa League group stage.