Representatives of FIFA, the FA and the Premier League are due to meet to discuss the saga of Tevez's proposed move to Manchester United.
The transfer has ground to a halt amid a deluge of legal arguments over who owns the player's registration.
The Argentina striker's advisor Kia Joorabchian last week accused West Ham of saying one thing in private and another in public in their stance on the Tevez ownership issue, something the Upton Park club strenously deny.
But Magnusson has admitted he doesn't expect Tevez to stay.
He told Swedish newspaper Aftonbladet: "At the moment, he's our player but he wants to play in the Champions League.
"I think he will be leaving soon."
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