What happened: Cubs starter Edward Cabrera is returning to the injured list with a left hamstring strain, manager Craig Counsell announced. Cabrera will undergo an MRI on Wednesday to determine the severity of the injury. "We're in a rough spot," Counsell said.

Why it matters: Losing another starter strains a Chicago rotation that has already absorbed multiple setbacks this season, forcing the staff to lean harder on its remaining arms and bullpen. With the Cubs sitting at 40-37 and trying to stay in contention, durability in the rotation is critical heading into the heart of the schedule. Counsell's blunt assessment underscores how thin the team's pitching depth has become.

What to watch: The MRI results Wednesday will set the timeline for any IL stint and clarify whether Chicago needs to look outside the organization for rotation help. Watch for a corresponding roster move and Counsell's update on who fills the vacated start.