[8] Coming on in the 65th minute for Eduardo Sosa, Díaz assisted fellow debutant Romario Williams in scoring a 90th-minute equalizer as part of a 2–2 draw.

[10] During the 2020 season, Diaz was part of the Columbus team that won the 2020 MLS Cup, making a total of 25 appearances for the club.

[12][13] However, an injury on national team duty led to his withdrawal from the squad,[14] and caused him to miss three straight games for Columbus.

[15][16] After returning in time for the unveiling of Columbus' new stadium, Díaz participated in the Gold Cup with Costa Rica, resulting in his absence from the following four league games.

Notably, he made a substitute appearance in the 64th minute to help his team secure a 2–0 victory against Cruz Azul in the 2021 Campeones Cup.