Celta de Vigo and Baloncesto Rivas Méndez began his coaching career in 2001, when he began coaching
Celta de Vigo. In 2011, he signed a contract with
Baloncesto Rivas. Under Méndez's tenure, Rivas reached the
EuroLeague final and won the
Copa de la Reina.
Schio In 2013, Méndez signed a contract with the Italian club
Schio. In his first season with the club, Schio won the Supercoppa Italiana, Coppa Italia and the LBF title in the 2013–14 season, a feat they repeated the following season. Schio won another league title in the 2015–16 season and played in the
EuroLeague in their first season there. At the beginning of the 2016–17 season Méndez won his fourth (and final) Supercoppa Italiana with the team.
UMMC Ekaterinburg In 2018, Méndez was hired by
UMMC Ekaterinburg. Under his tenure, UMMC won four straight Russian league titles between 2018 and 2021 and the EuroLeague championship 2018, 2019, and 2021.
Fenerbahçe On 15 April 2025, he signed with the Turkish powerhouse
Fenerbahçe. ==National team coaching career==