The 2019–20 season was the 121st in Athletic Club’s history and the 89th in the top tier.

[1][2] The season marks the first since the 2006–07 without Markel Susaeta who departed to Gamba Osaka in the summer and the first since 2007–08 without Ander Iturraspe who departed to RCD Espanyol in the same summer.

[4] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

In Out According to the official website:[11] Source: Competitions League table

Source: La Liga Results by round Semi-finals Final