Per football.london, he will have to sit out the game against Brentford at the weekend, as he is still their player.
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Aaron Ramsdale, who has been demoted since Raya's arrival, will be in line to start.
Ramsdale was a regular for the club last season, but does not possess the passing ability that manager Mikel Arteta is seeking.
Another who is a doubt for the weekend game is winger Gabriel Martinelli.