 Despite the resignation of head coach Garry Monk, he was the first signing under new owner Andrea Radrizzani.On 6 August 2017, Sacko made his Leeds United debut as a permanent player in a 3–2 victory at Bolton Wanderers.On 19 September, after a spell out the side, Sacko made a scoring return for Leeds scoring the opening goal of the game, in their League Cup tie against Premier League side Burnley in a penalty shootout victory after a 2–2 draw.