It is well known that the Championship is a tight division and McCarthy insists just because Charlton are 10 points adrift at the foot of the table it does not make them easy opponents.
"There were mixed feelings about their result in the week," he told the club's official website. "We all know what the league is like and you only have to look at the results every week to prove it.
"We don't know how Charlton will approach the game. Is a point any good to them? Probably not. But that doesn't mean they will necessarily come and attack us because there are plenty of different ways to win a game.
"You can keep it tight and nick one on the break, get a goal from a corner or free-kick or seize on a mistake from the opposition - we won't really know what Charlton are going to do until they turn up."