Oularé came through the youth ranks at Lille OSC and signed for Belgian side Club Brugge in 2013.[4] He made his Belgian Pro League debut on 14 September 2014 against K.R.C. Genk. He replaced Nikola Storm after 64 minutes.[5]
His first league start came on 21 September 2014 against K.V. Kortrijk, in which he also scored his first league goal in a man of the match performance.[6] On 20 August 2015, while playing for Club Brugge, Oularé tweeted an apology for his lackluster performance coming off the bench against Manchester United in a Champions League playoff game at Old Trafford.[7] Earlier that day, it was widely reported in the Belgian press that Club Brugge's manager Michel Preud'homme had given Oularé a dressing down in front of his teammates in the dressing room after that game.[8]
Watford
On 1 September 2015, Oularé signed for Premier League side Watford for an undisclosed fee rumored to be around £6 million on a five-year contract.[9] He made his debut for the club in an FA Cup tie against Newcastle United on 9 January 2016. He was substituted at half time.[10]
He made his Premier League debut, against Swansea City in a 1–0 Watford defeat, coming on as a substitute for Valon Behrami in the 87th minute.