The centre-back has been struggling with a back injury since the middle of last month and is out of tomorrow night's game at home against Southampton. He is also a major doubt for Wednesday's potential title decider against Manchester City at the Etihad.
Saliba is not recovering as quickly as Arsenal had hoped and he now faces a fight to play a part during the final seven games of the season.
The Gunners are four points clear of Manchester City at the top of the Premier League, although Pep Guardiola's side have a game in hand.
"Regarding William, we still have to wait a little bit more," said Arteta. "He is not progressing as quick as we hoped.
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