Brother of former WorldTour rider suspended for positive doping test

The announcement was confirmed by the Portuguese Anti-Doping Agency (ADoP) in its latest update to the disciplinary sanctions framework. Guerreiro’s positive test occurred following his stage victory at the GP Douro Internacional in June 2024.

Guerreiro, who has been provisionally suspended since 2024, has already served 462 days of his sanction, which is set to end on December 29, 2028.

The 25-year-old Portuguese rider last raced for the GI Group Holding-Simoldes-UDO team, and was a former winner of the mountains classification at the Volta ao Alentejo in March 2024.

Guerreiro’s brother, Ruben, is a former WorldTour rider, having most recently raced with Movistar in 2025. Ruben won a stage and the mountains classification at the Giro d’Italia in 2020, the Mont Ventoux Challenge in 2022 and also the GC at the Saudi Tour in 2023.

Separately from Francisco, Ruben was in the headlines at the start of 2026 after ASreported on Sunday stated that Guerreiro had “failed to report a trip during this past season to ADAMS (Anti-Doping Administration System),” and the newspaper claimed that the incident had led to an “irreconcilable rift” between the rider and Movistar, explaining his departure from the team. 

However, speaking to Portuguese publication Topcycling, Guerreiro rejected the AS report, insisting that he had no whereabouts strike against his name.