Ferguson's reassurance comes after reports in Spain linked the 21-year-old with a move back to his former club Barcelona.
"I can see him playing 25 to 30 games," Ferguson told the Daily Star. "He's becoming a really good defender.
"It'll be hard with Rio and Vidic but you need good players."
Reports in Spain say that Barca are interested in the services of Pique after a knee injury forced central defender Gabriel Milito out of action for at least six months.