Qualifying for the Champions League has boosted OM's chances of keeping hold of Saliba after this season's successful loan.
Cardoze told BFM Marseille Provence: “There is a budget to stick to and there is a desire on the part of the owner to ensure that this club is in balance.
"There are financial fair play requirements.
"Saliba? William's will is beyond doubt. He obviously told Pablo (Longoria, president), he told me again on the pitch on Saturday evening. He is sincere. Now there is a contractual reality. He belongs to Arsenal.
"Now, if his will is to stay with us, we'll see. Everyone wants him to be there next season."
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