Timber and Saliba, who were rested due to minor 'niggles' during the midweek Champions League fixture, are now fit for selection.
Kai Havertz, who scored in his first competitive start in over a year, is also available for the upcoming match against Leeds, though his playing time will be managed.
With Ricciardo Calafiori also in contention, Arsenal will have an almost fully-fit squad, with only youngster Max Dowman sidelined.
Arteta dismissed concerns about the team's mentality following a recent defeat, emphasising the club's strong position at the top of the Premier League table.
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