However, the boss has since discovered that the offending print was of the West Brom badge, drawn on by Scharner's son.
"I'm sorry I even got involved in that because Scharner played well," McCarthy said.
"There was a lot made of it before I even knew what was on the shirt. Having found out there was a West Brom badge on it, I thought 'What the hell?' and it didn't bother me.
"People forget sometimes that I've been a player, and when someone does that to you when you're hurting, those are the kind of things that upset you."
McCarthy revealed earlier today that his side's poor form has dented his pride.