It's understood that the FC Barcelona academy graduate is a player of interest ahead of the club's Championship return, making him one of a number of striker targets following Liam Delap's departure.
The Athletic have claimed that talks will wait until after Chelsea's Club World Cup campaign have finished, with Kieran McKenna's side among the teams interested in signing the Spaniard to bolster their attacking depth.
There's a good chance that they will have to wait until after the end of the tournament, with Enzo Maresca's men boasting a strong chance of reaching the final on Sunday, July 13th.
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Chelsea finished third in Group D, behind Flamengo but ahead of Esperance and LAFC. They have since beaten Portuguese outfit Benfica and will face Brazilian giants Palmeiras in the early hours of Saturday morning.
Victory in that match would see them reach the semi-finals, facing either Fluminense or Al Hilal.
Having already signed Delap from Ipswich for £30m, the Londoners are seemingly set to bolster their squad further, with reports suggesting that Brighton's Joao Pedro will fly out to the United States to complete his move ahead of their game this weekend.
Wih so many options to lead the line, Guiu looks set for a summer move. Town will look to tempt him to the Championship, but the 19-year-old has also been linked with a move to Ligue 1 side Strasbourg, who are part of the same ownership group as Chelsea.