On 18 February 2021, Koïta was suspended for three months of all club and international football activities by UEFA, following a doping investigation conducted by UEFA on which Koïta tested positive.[5] Koita was prescribed medicine to combat altitude sickness that contained a substance on the banned list. In its verdict, UEFA ruled that in this case there was no intentional violation of doping rules, but the rules stipulate that every player is personally responsible for ensuring that no banned substances enter their body.[6]