Middlesbrough have signed striker Emmanuel Latte Lath from Italian club Atalanta, and defender Lukas Engel from Danish Superliga side Silkeborg, both on four-year contracts.
He came through the ranks at Atalanta, scoring once in three senior games.
Danish left-back Engel, 24, has 30 goals in 189 senior games and signs a four-year deal with the Teessiders.
While Engel has played for just three professional clubs in Fremad Amager, Vejle and Silkeborg, Latte Lath has spent time on loan with eight sides including SPAL, Pescara, Imolese and Aurora Pro Patria.
"Lukas is a good age," head coach Michael Carrick told the club website.