I don't think basketball allows for that. I think once you play that first game, your eligibility is used for that year. The 4 game rule is a football only thing. I looked it up the other day.I think he can play in two more games and still keep the redshirt. I think.
I don't think he's really played since he got sick, so he may still be dealing with that. I'm not going to fret about it just yet. He still has time to get back in the rotation, and get into rhythm before the tourneys start.