The two side's played out an entertaining 2-2 draw at The Molineux which means Wolves will now have to travel to Boundary Park for the replay.
"I am delighted to still be in the hat." McCarthy said.
"It was a fair result. They deserved it for their second half performance when there is no doubt they were better than us."
"We knew they were a good side. They are bright and they do things nice and quick. At the end of the day they deserved another game."