*Club domestic league appearances and goals, correct as of 18:06, 17 September 2024 (UTC) ‡ National team caps and goals, correct as of 03:10, 16 October 2024 (UTC)
Born in Rubí, Barcelona, Catalonia, Fernández and Toni Fernández began their career at Espanyol, before making the switch to Barcelona in 2018.[2] In March 2022, following impressive performances for the club's Infantil A squad, he was promoted to the Cadet B team - playing with players a year older than himself - and marked his second appearance with a goal.[3]
The following year, in August 2023, he was included in Barcelona's under-18 squad, despite only being fifteen, for their pre-season preparation.[4] He was given his debut in the UEFA Youth League by youth team manager Óscar López in September, becoming Barcelona's second-youngest player in the competition, behind Lamine Yamal.[5] Continuing his meteoric rise at Barcelona, Fernández was included in the first-team squad's training for the first time in October 2023, alongside fellow youth players Pau Cubarsí, Marc Guiu and Áron Yaakobishvili, due to the absence of a number of first-team players.[5][6] In September 2024, Fernández was included in senior team's squad for several La Liga and UEFA Champions League games, but so far remained on the bench in all of them.[7][8]
International career
Fernández has represented Spain at under-15 level.[1]
Personal life
Fernández' cousin is fellow Barcelona player Toni Fernández; the pair's fathers are brothers and their mothers are sisters.[2]
^Rogé, Albert (28 March 2022). "Guille Fernández se gana el ascenso" [Guille Fernández wins promotion]. sport.es (in Spanish). Retrieved 15 October 2023.