Boyd (0-1) took the loss in Game 1 of the NL Wild Card Series against the Padres on Tuesday. He gave up four runs on five hits with four strikeouts and a walk over four innings.
The Cubs outrighted Kelly to Triple-A Iowa on Tuesday.
Gausman will start Game 2 of the wild-card series versus the Padres on Wednesday, Sahadev Sharma of The Athletic reports.
Gausman (shoulder) is on the Cubs' roster for the wild-card series against the Padres, Jared Wyllys of AllCHGO.com reports.
Steele (elbow) is not on the Cubs' roster for their wild-card series versus the Padres, Meghan Montemurro of the Chicago Tribune reports.
Thielbar is not on the Cubs' roster for their NL Wild Card Series against the Padres, Meghan Montemurro of the Chicago Tribune reports.
Taylor went 2-for-4 with two runs scored in Sunday's 6-2 win over the Red Sox.
Rea tossed two scoreless innings of relief with a strikeout to earn the save in Sunday's 6-2 win over the Red Sox.
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.
Garrett (1-1) earned the win over the Red Sox on Sunday, allowing one run on four hits and three walks with two strikeouts over five innings.
