[4] At the time of his call-up, Reininger was pitching for Tigers' Triple-A affiliate, the Toledo Mud Hens, where he had a 1–0 record, 1.59 ERA, and held opponents to a .179 average in 11+1⁄3 innings of work.

He made his Major League debut on August 27, 2017, where he struck out a man and gave up two runs on three hits and a walk in an inning of work.

He spent the 2021 season with the Double–A Midland RockHounds, making 5 starts and registering a 1–4 record and 4.63 ERA with 23 strikeouts across 23+1⁄3 innings pitched.

[9] On August 1, 2022, Reininger signed with the Cleburne Railroaders of the American Association of Professional Baseball.

On February 8, 2024, Reininger signed with the Winnipeg Goldeyes of the American Association of Professional Baseball.