Pogba worth more than €100m - Pirlo
"Of course, Juventus will want to keep him," he told The Mirror.
"But sometimes you can get to a transfer fee that you can rebuild an entire team with and he would get to that fee.
"At his age, you can build a team around him for the next years. If he does decide to leave, then I think it will be for a world record."
Pirlo played with Pogba at Juve before the veteran midfielder's move to New York City last year.
The 36-year-old was full of praise for his former team-mate, saying: "I have played with some great young players, but Pogba was the best young player I have ever seen.
"We saw from his first training session with Juventus that he was special. There was a disbelief among the senior players that Manchester United had allowed him to leave.
"Since then he has grown physically and as a player. For me he is now the most complete central midfield player in the world."