Hernandez (calf) was claimed off waivers by the A's on Thursday, John Shea of the San Francisco Chronicle reports.
Hernandez finished the season on Arizona's injured list with a calf strain, and he was recently removed from the 40-man roster. The 24-year-old appeared in 12 big-league games in 2022 and went 2-for-24 with two runs and two stolen bases.