The Catalans are reportedly nearing a £25.5million deal for a player also eyed by Manchester United, Tottenham and Chelsea.
Having found great form in Croatia over the past two seasons, Olmo stepped up to the Champions League this campaign and impressed as Zagreb narrowly missed out on a place in the last-16.
With a place in Spain’s Euro 2020 squad in his sights, a January move is on the player’s agenda.
And Goal claim Barcelona are leading the race to sign him.
Source: The Sun