Leeds have signed Hadi Sacko on a permanent basis following a successful loan spell last season.
The 23-year-old, who spent 2016-17 at Elland Road, has now signed a three-year contract after the club triggered a clause in the terms of the loan deal from Sporting Lisbon.
The French winger made 42 appearances for Leeds, currently managerless following Garry Monk's resignation, as they just fell short in their bid to make the Sky Bet Championship play-offs.
Leeds' managing director Angus Kinnear said on the club's official website: "We are delighted to announce the signing of Hadi today, he is an exciting player with great potential and a player we hope to see develop over the next three years."