The Scotland international has scored six Premier League goals this season, and has caught the eye of the British media due to excellent performances for the Molineux outfit.
Despite rumours linking Fletcher with a move to a bigger club, McCarthy insists he is going nowhere.
“No. If I say yes then I’ve suddenly put him up for sale haven’t I? So, categorically, no,” the Wolves boss told Mirror Football.
“He’s a Premier League player scoring goals so he’s going to get headlines. Players always do when they’re scoring goals.
“All Fletcher can do is play and score, for his career here and his Scotland career.
“He’s still only a young man, so all he can do is keep playing well and scoring. It’s a great feeling as a footballer to be playing well.
“He’s a very good player, he’s excellent. It’s his all-round game, but as with all strikers it’s his goals that top his performances off.
“And he wants to score. He loves scoring,” McCarthy concluded.
Fletcher will look to continue his good run of personal form for Wolves as they take on Stoke at home on Saturday.
By Gareth McKnight