Arsene Wenger says the visit of Crystal Palace to Emirates Stadium on Sunday has come too soon for Jack Wilshere, who is edging ever closer to a maiden first-team appearance of 2015-16.
The England midfielder has yet to feature this season after breaking his leg, but has stepped up his recovery with the Under-21 side in recent weeks.
Wilshere played the full 90 minutes on Thursday in a 3-1 defeat to Swansea City, but Wenger is reluctant to throw him in against Palace in the Premier League this weekend.
Asked when Wilshere was likely to return, Wenger replied: "I don't know. He needs one more game.
"He will play again [for the Under-21s] on Monday and then we have to see how he is compared to other players.
"If he is ready [for West Brom next Thursday] then we will consider him."