Sagnol won the World Cup with Real coach Zinedine Zidane.
He told RMC: "All the factors are there for Pogba to reach Real Madrid.
"Florentino (Perez, president) and Zidane want it, as does Pogba, too - and Manchester is even almost glad.
"It would mean they would part with a high fee and would have money to invest. It is something that is going to happen."