The Rockies returned Rule 5 pick Petit (elbow) to the Tigers on Tuesday.
The Reds outrighted Johnson to Triple-A Louisville on Thursday, Charlie Goldsmith of Fox 19 Now Cincinnati reports.
Flaherty (forearm) was reinstated from the 15-day injured list Sunday and struck out one batter while allowing one hit and no walks over two scoreless innings in the Tigers' 4-2 loss to the Pirates in the season finale.
The Tigers optioned Hurter to the rookie-level Florida Complex League on Sunday.
Madden tossed three scoreless innings of relief with three strikeouts in Sunday's 4-2 loss to the Pirates.
Valencia went 1-for-4 with a solo home run in Sunday's 4-2 loss to the Pirates.
Williamson (5-5) took the loss Sunday against Toronto, striking out three while allowing four runs on four hits and three walks in three innings.
Ryan (0-1) took the loss against the Pirates on Sunday, allowing two runs on three hits and two walks with three strikeouts over 1.1 innings.
McGonigle went 2-for-3 with a solo home run in Sunday's 4-2 loss to the Pirates.
Dingler is not in the starting lineup for Sunday's game against the Pirates.
