Born in Granollers on 4 January 2006, Marc Guiu rose swiftly through Barcelona's famed La Masia to announce himself on the senior stage, a profile that has become sought after by collectors and fans alike. Available through Walkouts, authenticated items linked to his early breakthroughs, such as match-worn shirts and signed merchandise, carry clear provenance that appeals to memorabilia enthusiasts.
Guiu's footballing education began with Penya Barcelonista Sant Celoni before entering Barcelona's academy in the 2013-14 season. He progressed through the youth ranks as a forward who combined physical power with a natural eye for goal. That development led to his inclusion in first-team pre-season activities in June 2023, and to an unofficial debut off the bench in a friendly against Vissel Kobe.
The leap to competitive senior football was rapid. On 22 October 2023 he made his La Liga debut as a substitute and scored with his second touch to secure a 1-0 win over Athletic Bilbao, becoming both the youngest and the fastest debutant to score for Barcelona in the competition. He followed that appearance with outings in continental competition, recording a first Champions League goal in the same season.
On 1 July 2024 Guiu completed a move to Premier League club Chelsea, signing a five-year contract. He made his league debut on 18 August 2024 as a substitute against Manchester City. During the 2024-25 European campaign he produced a notable performance against Shamrock Rovers, scoring a first-half hat-trick in a 5-1 Conference League win on 19 December 2024, and contributing to Chelsea's run to the competition title that season.
For the 2025-26 season Guiu moved on a season-long loan to newly promoted Premier League side Sunderland on 6 August 2025, continuing his development in England's top division. Across these moves, his shirts, signed items, and authenticated memorabilia have been linked to specific match dates and competitions, which enhances provenance and cataloguing for collectors seeking verified pieces.
Internationally, Guiu has represented Spain at underage levels, notably finishing as joint top scorer with four goals in the 2023 UEFA European Under-17 Championship, and earning a place in the tournament Team of the Tournament. He also featured at the 2023 FIFA U-17 World Cup, where he added further goals to his youth international record.
From a collector's perspective, items associated with precise milestones, such as his scoring debut for Barcelona, his hat-trick in European competition, and his youth international honours, carry strong provenance value. Verified autographs, match-worn shirts with documented match dates, and certificates of authenticity are the primary attributes sought by memorabilia collectors and are central to responsible curation and sale of merchandise.
Looking ahead, Marc Guiu's early achievements, including a domestic debut goal, continental scoring, and squad honours such as the UEFA Conference League 2024-25 and the FIFA Club World Cup 2025, form a clear provenance thread for collectors. For those assembling authenticated collections of signed shirts, autographs, and official memorabilia, pieces tied to these moments provide documented narratives. As his career progresses, Walkouts remains a reference for sourcing officially verified collectibles that capture the provenance and story behind each item.
