Joining the Premier League title hopefuls from Prva HNL outfit Hajduk Split, Pasalic - fondly nicknamed in some areas of the media as 'the new Luka Modric' - was reportedly also a transfer target for Manchester United prior to his switch to Stamford Bridge, but Chelsea have definitely won the race for his signature.
World Cup heartache
Aged just 19, midfielder Pasalic - a regular for his country at youth level - came desperately close to a place in Croatia's senior squad for the World Cup in Brazil.
Having been included in Niko Kovac's initial 30-man preliminary party, he was unfortunately cut when it was time for the former Bayern Munich star to reduce the numbers down to 23.
Pasalic's mere inclusion in the thought process ahead of such an important tournament should have come as a major boost to the player's confidence, however, especially when you consider that the 2013/14 season was his very first full season as a member of the first-team at Stadion Poljud.
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Now his move to Chelsea in complete, it remains to be seen what Jose Mourinho has planned for Pasalic for his maiden campaign in English football.
While such an ambitious and talented youngster - who joined several of his new teammates in pre-season training today - may have designs on already attempting to force his way into the squad at Stamford Bridge, it is unlikely that he will succeed to that end with competition for places so fierce in Mourinho's current midfield.
Chelsea's sizeable collection of youngsters have struggled to make the transition into regular football for the Blues in recent years and it seems far more likely that Pasalic will follow in the footsteps of the likes of Tomas Kalas and Thorgan Hazard and be afforded the opportunity to further develop and enhance his experience out on loan.
This deal for Pasalic was obviously completed with one eye on the future, yet Mourinho's eagerness to do business during the relatively early stages of the transfer window clearly signifies a lot of ambition on his part.
With Spanish internationals Diego Costa and Cesc Fabregas having already agreed to join Chelsea and more heavyweight additions expected to follow, it appears that Mourinho is extremely keen to ensure that his side do not endure another trophyless campaign.