"Darren isn't a right winger, but he is doing a brilliant job for us there," McCarthy told the club's official website.
"He is a central midfielder playing on the right, but on Saturday he put in arguably the best cross of the game.
"Players want to play football and he has got that since coming to Wolves and he is thriving on it.
"He's a player I would like to sign if Liverpool would let him go, but there's a lot of 'ifs'."