Dear colleague, your query is intriguing. I am afraid you need to put your thought process in the proper direction. Think: in what way will questioning the manager about the absenteeism of his teammate help resolve the issue? Does it not amount to finding a lost car key in the house when it was left in the car? In other words, when the problem is in the East, you are looking for a solution in the West.
In this process of thinking, you are questioning your assumptions. Think about how to fix the problem of absenteeism of a teammate and not fix the manager. So, turn your focus on taking appropriate actions to curb the problem of absenteeism of an employee. Together, you and the manager can partner in resolving it.
You need to study the nature of the absenteeism record - is it sporadic, is it a long absence at a stretch, or frequent short durations of absence - in other words, the habit pattern as seen from the record. Then analyze the reasons for it in a one-on-one meeting with him, from coworkers, the manager, and his attitude towards it. For every problem, one must find the root causes.
After you and the manager reasonably size up the problem, find what will work - disciplinary action or counseling. The purpose is to make him understand and give an opportunity to show distinct improvements in the coming period. I don't claim this is the only approach. You may think of a better one by keeping in mind the end results to be achieved.
Regards, Vinayak Nagarkar HR and Employee Relations Consultant