Borussia Dortmund have made FC Nordsjaelland and Turkey winger Emre Mor their fourth summer signing.
The 18-year-old, who is the third-youngest player at Euro 2016, signs a five-year deal for an undisclosed fee.
On Monday, Dortmund signed Bayern Munich midfielder Sebastian Rode, 25.
Last week, they agreed a deal for Barcelona's Spain defender Marc Bartra, 25, after meeting his £6.25m release clause and previously signed Rennes forward Ousmane Dembele, 18.
The Rode and Dembele deals were completed for undisclosed fees.
Find all the latest football transfers on our dedicated page.