The Gunners are set to take on Bournemouth in the Premier League this weekend.
While Timber is not likely to start, the defender may be fit enough for a spot on the bench.
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"Yes everybody is fit and available," the Spaniard said about the team news ahead of the game.
"So now it's the headache to make the right selection."
Timber has been absent with a long-term injury since the very first matchday of the season.