Leeds United have signed Sporting Lisbon winger Hadi Sacko for an undisclosed fee on a three-year deal.
The 23-year-old Frenchman spent the 2016-17 on loan at Elland Road, scoring twice in 38 league appearances.
He is the first player to sign for the Whites since Andrea Radrizzani completed his takeover of the club on 23 May.
The Championship side are looking for a new manager after Garry Monk resigned last week.
Find all the latest football transfers on our dedicated page.