It seems unlikely that Obi will be given any first team minutes this season, unless they are dominant performances like the 5-0 win against Chelsea in midweek.
Arsenal have a number of tough clashes on the horizon and can't afford to drop points - given the fact Manchester City are following just one point behind in second.
The north London derby is next for Arteta's side, as they travel to the Tottenham Hotspur Stadium in a bid to secure bragging rights and a vital three points.