Middlesbrough have announced Adama Traore has joined the club on a four-year deal from Championship side Aston Villa.
Traore's move means Boro have now signed 11 players during the summer transfer window.
Traore was brought by Villa last summer for £7m from Barcelona but he frustrated the club's managers during his spell at the club, due to his tactical approach.
The 20-year-old failed to start a single Premier League match last season with Villa.
'He is another important player and I am expecting a lot from him,' Aitor Karanka told the club's website.