OM are in negotiations to take Saliba on-loan for the new season and wish to include a permanent option in the deal.
Saliba also has interest from the Premier League, but favours a return to France.
An unnamed OM director confirmed to La Provence: "Negotiations are underway".
OM are due to confirm a similar deal for Saliba's Arsenal teammate Matteo Guendouzi. The midfielder is currently in Marseille to finalise the move.
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