The Chilean's hamstring injury may not be as bad as first thought and he may make the clash with Manchester City.
The influential forward pulled up in the recent 1-1 draw with Norwich with a hamstring injury, with the Gunners fearing they could lose him for a long spell.
That would be a big blow to Arsene Wenger’s side, with the Chilean having been fine form for the side for them this season.
He and the club are now nervously waiting for a more definitive answer on the issue, with those expected on Wednesday.
However, the initial signs from his hamstring injury suggest he may not have suffered a serious tear, meaning he would have an outside chance of making the game against City.
He and Santi Cazorla are definitely out of Arsenal’s crunch clash in the Champions League with Olympiacos next Wednesday though, with the Spaniard suffering ligament damage in his knee according to the Telegraph.
How Wenger’s side will survive without their star man will be an interesting development, given how impressive he has been.
He is currently their joint highest goalscorer this season with nine goals, alongside Olivier Giroud, and replacing that threat will be a serious challenge for the team in his absence.