The Athletics acquired Johnson from Atlanta on Monday in exchange for Nick Allen.

Johnson spent the entire 2024 regular season with High-A Rome. Across 38 outings he registered a 2.60 ERA, 1.31 WHIP, eight saves and a 61:27 K:BB across 52 innings. The 23-year-old right-hander will look to work his way up through the Athletics' organization.