Unai Emery says he will monitor Nicolas Pepe's progress in training before deciding if he will face Newcastle United this weekend.
The 72m signing did not play in Sunday's loss to Barcelona, with Emery confirming he stayed behind to train in London.
Speaking after the game, Emery couldn't guarantee if the Ivory Coast international would start in this Sunday's Premier League opener.
Emery said: "He is training with us for two days only and today we spoke and it was better to be continuing working alone in Colney.
"Tomorrow we are going to do training together with us and I think each day for him and for us is information we can receive on how he can be for the next training and next match, but with him I want to patient and also see every day how he is taking the pieces and the rhythm with us and also to see how we can play with him.
"He is in the same situation as other players who came in the same days. For example today with Lucas, after a week of training, today was his first minutes. After two training sessions I think it is best to keep training."
