There is much excitement about the £47.5million man's ability to bring the ball from defence in the style of Rio Ferdinand but, while Allardyce shares in that, the priority remains keeping the back door shut.
"Nobody is going to stop John Stones playing from the back...but every centre-half is judged on his defending first and foremost. If anybody tells you different they're not telling the truth," he said.
"John plays as a defender and he can use his ability when we're in possession. He's got a dual role and he can be creative when we've got ball.
"If he can come out from the back and make a killer pass or help with an assist we will cover that by other players filling in."
Referring to his up-and-down season at Everton last year, during which he was dropped by Roberto Martinez, Allardyce said: "He's a young man who had a great time, then a little bit of a problem.
"Now he's got a big move and is looking very comfortable again.
"I just hope for all that experience in such a short period of time he's now a better player than he was a couple of years ago. Certainly he's a very big talent."