Toon boss Chris Hughton has raised the possibility this week.
But Super Mac told the Evening Chronicle: "To take the No 9 shirt for Newcastle United, you have to have confidence in your own ability.
"Does Andy Carroll have it? The only person who can answer that question is Andy himself. But just saying 'Yes' is not enough, he has to prove it.
"Not many have it, it's a huge honour with a great legacy. You're following some pretty special guys.
"Many players have put it on and not been able to do what's asked of them.
"What the shirt stands for is an inheritance deemed huge by the club and by the fans. It's handing over a responsibility to score goals, simple as that.
"If you're the No 9 it's about growing into the shirt, taking that responsibility. Only Andy will know if he is up to the task."