France under-21 international defender he has joined German side Borussia Dortmund in a deal worth € 28 million ( $ 33 million ) . Diallo joins from fellow Bundesliga side lens , which he joined last year following a € 5 m move from league 1 side lens . He is billed as a replacement for Greek defender Sokratis ##kis who recently joined Premier League side Arsenal .
France under-21 international Abou Diallo has joined German side Borussia Dortmund in a deal worth €28m ($33m). Diallo joins from fellow Bundesliga side Mainz, which he joined last year following a €5m move from Ligue 1 side Monaco. He is billed as a replacement for Greek defender Sokratis Papastathopoulos who recently joined Premier League side Arsenal.