Eddie Nketiah turned down the club's latest contract offer, dealing another blow to the hopes of keeping hold of the player.
He will be free to sign a pre-contract with a foreign club from January onwards, as his current deal ends at the end of the season.
Sky Sports News has been told that Nketiah's decision is not motivated by finances but by a lack of first-team opportunities.
Nketiah has yet to feature in the premier league this season, but Mikel Arteta wants him to stay.
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