Signed last summer from St Etienne, Saliba was loaned back to ASSE for this season, where he has shone despite some injury problems.
Fabio Frasconi, who coached Saliba as a junior with AC Bondy, has no doubts about the defender's potential.
"William will go far, very far," he said.
"He reminds me of Raphaël Varane. As a kid, he was already above the rest, technically clean, comfortable with the ball.."