The Spaniard has caught the eye of plenty of clubs across Europe after a string of impressive performances for the Croatian champions.
Zagreb want at least £34million for the 21-year-old forward, who has already faced City in this season's Champions League.
Olmo views it as the perfect time to seek a move to one of Europe's top leagues after earning his first senior Spain call-up for their upcoming Euro 2020 qualifiers against Malta and Romania.
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