The 21-year-old looks finally set to be a part of the Gunners squad three years after joining from Saint-Etienne for £27million.
Marseille are keen to turn his temporary stay into a permanent switch amid claims the club are poised to submit a £26m bid.
But the North London giants will refuse to part ways with the youngster, with Saliba to challenge Ben White and Gabriel Magaelhaes for a starting spot.
Reporter Chris Wheatley has now revealed that the ex-Nice loanee could be closing in on a new contract.
He tweeted: "William Saliba contract talks going positively with Frenchman set to return for pre-season training shortly.