Skubal suffered an undisclosed injury, and it has yet to be determined if he will be in Game two of the Wild Card series against the Astros on Wednesday.
Baez has been transferred to the 60-day injured list due to lumbar spine and hip inflammation, and team officials have yet to provide an exact return date.
Gipson-Long has been shifted to the 60-day injured list while recovering from surgery to repair the UCL in his right elbow. He will be sidelined for the entire 2024 season.
McCullers has hit the 60-day injured list after having surgery to repair a flexor tendon in his right forearm, and he is projected to miss the remainder of the season.