The Reds signed Danner to a minor-league contract Jan. 7.
Danner spent the entirety of the 2025 campaign at Triple-A Tacoma in the Mariners organization, collecting a 5.59 ERA and 54:21 K:BB over 56.1 frames. The 27-year-old made one major-league appearance for the Blue Jays in 2023. He'll give the Reds some relief depth at Triple-A Louisville.