The Dutchman has not played in the Premier League since the opening weekend of the campaign.
Timber suffered a serious knee injury at the time, which has kept him out all term.
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Asked about his summer signing, Arteta told reporters: He is doing very well.
He is back training. He is not far off, the thing is that last step. He has not played any minutes.
So, does he need a game with Under-23s? Does he need two games? That last part, which is tricky and sometimes it takes a while, hopefully it's as quick as possible.
I think he has got a good chance. I don't know the percentage but I think he has got a good chance and he is going to push it as far as he possibly can."