The Blues are aiming to sign a young centre-forward and they have identified Guiu as their top transfer target.
They are currently close to agreeing terms over a long-term contract and will trigger his €6m release clause soon.
Guiu has made only seven senior appearances for the Catalan giants, but he has made his mark with two goals.
He will face a tougher test in the Premier League, but the Blues appear to have the belief in his overall abilities.
Guiu could be the club's only striker signing this summer, considering the limited funds due to the PSR limits.
Aside from a striker, the Blues could focus on landing a new winger, left-back and a goalkeeper this summer.
On the other hand, they are expected to part ways with the likes of Armando Broja and Trevoh Chalobah.