Jack Wilshere will see a specialist to assess his ankle injury, Arsenal manager Arsene Wenger has announced.
Wenger confirmed that Wilshere would be "out for a while" after coming off during the 2-1 defeat by Manchester United on Saturday after feeling some discomfort.
Wilshere, who was replaced by Santi Cazorla in the 55th minute of the game at the Emirates Stadium, will therefore miss the Champions League clash with Borussia Dortmund on Wednesday.
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Wenger did confirm, however, that Laurent Koscielny is back in the squad following an Achilles problem and Danny Welbeck is expected to be included, although striker Olivier Giroud is not registered and Theo Walcott is still ruled out.
Wenger admitted concern over Wilshere’s injury, although X-rays after Saturday’s match indicated there was no bone break.
"I cannot give you any time schedule there because he will be out for a while and he has to see a specialist next week to see how long he will be out. We don’t know at the moment," said Wenger at Tuesday afternoon’s press conference.
"He has a big ankle sprain and I don’t want to talk about it because I am not a specialist medically.