The in-form American keeper took a bit of a battering from the Charlton forwards and was left hobbling slightly after a few collisions. Another goalkeeping injury would be just about the last thing Glenn needs as he seeks to build on such a positive start to the season.
Neil Sullivan was ruled out this week for an estimated two months after breaking his thumb in training.
"I said something to Jason Euell over in the corner and asked 'how many times are you going to hit me tonight?' laughed Kasey after Tuesday's encounter.
"I've got bruises on my left side, my right side, stud marks on my leg. It was one of those days where, unfortunately in the position that you're in, you have to stick your body places where you really prefer not to...
"The manager was like 'come in, make sure you're fine for the weekend' and stuff."
Despite the bumps, Kasey is feeling in pretty good nick as the season enters full swing and already has two clean sheets to his name.
He insists he is still improving where his all round game is concerned and is much more than just a shot-stopper.
"I'm happy. I've been at this a few years now and I'm feeling better and better as each year passes.
"So much of goalkeeping is reading the game and I feel that side has come along fantastically in the last few years.
"If I can sneak out and get balls on the edge of the box and come for a few crosses to help the guys out - that's when I feel at my best.
"My shot stopping has always been there, but one criticism even Martin O'Neill had with me was that I didn't come for as many crosses as he'd have liked, or maybe I stayed on my line a little too much.
"Now I feel real, real confident in the whole aspect."
Kasey Keller revealed that the boss was particularly concerned over his welfare after the victory at Charlton on Tuesday.