The 19-year old Hajduk Split midfielder agreed a pre-contract with the Blues in January and is expected to complete his shift to west London when the next transfer window opens in June.
It is then expected that the German-born Croatia U21 international will head to either Lazio or Napoli on loan with Chelsea's director of sport Michael Emenalo telling the Italian press that Pasalic will need to move on from Split.
"Mario has outgrown Hajduk and in the summer he has to move to a bigger club. That is the only way for him to one day play at Stamford Bridge," he said.
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