Chelsea signed teenage Netherlands defender Jorrel Hato from Ajax in a deal worth a reported £37 million ($49 million) on Sunday.
Hato, who has been capped six times, agreed a seven-year contract with the Premier League club.
The 19-year-old is Chelsea’s eighth signing since the end of last season as boss Enzo Maresca strengths his squad to cope with the duel demands of the Premier League and Champions League this term.