The Blues are eager to bring in more young talent into the squad this summer.
Per Guillem Balague, Spanish football expert, the striker is available for a modest fee.
If Chelsea do a deal, Guiu will cost just €6 million (£5m), given he has a low release clause.
Chelsea are likely to bring him into the academy for the upcoming 2024/25 season.
He will then get a chance to showcase a claim for a first-team spot in the coming seasons.