I always thought you were eligible for OT pay for working your day off only if you worked all of your regular days?
That being said, I would imagine these people would still have some hours in this week left to work by Saturday. They may not be able to work a full day, but if they did work any hours on Saturday then they would in fact get their Monday as overtime.
Someone correct me if I'm wrong? Because we had a guy who thought he was shorted his Saturday overtime but he called in sick one day last week and I figured that was the reason.