Yaya Sanogo finally trained with his Arsenal teammates on 20 days before the Gunners begin their Barclays Premier League campaign.
Arsenal returned from a successful pre-season tour of Asia at the weekend, having won all four games, scoring 19 goals in the process.
Sanogo, bought from Auxerre, remains the club's only signing so far this summer, however.
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The France Under-21 international scored eight goals in seven Ligue 2 games last season, with four of his appearances coming from the substitutes' bench.
Arsenal commence their domestic campaign at home to Aston Villa a fortnight on Saturday.