Chelsea confirmed their signing of Mario Pasalic from Hajuk Split, with the player already joining up with his new team mates for pre-season preparations, SkySPORTS report.
The 19-year-old was part of the 30-man World Cup squad for his nation, but missed out on a place on the plane to Brazil.
He has already represented the Croatian national team at the U-21 level and should be a strong contender to appear for the senior squad in the near future.
Pasalic’s deal to make the switch to England was said to have been completed last season, but the transfer was only officially confirmed recently.
“I am very happy because I am now a Chelsea player,” he told the club’s official website. “I am very impressed by the training ground and I must thank everybody at Hajduk.
“This is now a new start in my career. I am a central midfielder, my favourite player is Frank Lampard and so I am very happy to be a Chelsea player.”