The Polish stopper has been unavailable for the north London club since February due to a shoulder injury, but it is thought that the stopper went over on an ankle in training on Tuesday.
This could well keep the stopper out of action until the new year, with initial reports stating that Fabianski could be unavailable for as long as three weeks.
First-choice goalkeeper Wojciech Szczesny is still on the sidelines also with injury, as an ankle knock has kept him out of consideration for the Gunners over recent weeks.
It is believed that Szczesny is still at least three weeks off making a return, with rehabilitation ongoing on his injured ankle.
In the meantime young Italian goalkeeper Vito Mannone has been deputising between the sticks for Arsene Wenger’s men, but the inexperienced stopper has shown some nerves whilst playing in big games in the Premier League and Champions League.
Arsenal have a frantic fixture list upcoming over the next month, with Norwich, Schalke, Tottenham and Fulham are ready to take advantage of any weakness in the north London club’s backline.
At the moment the only other options for Arsenal in goal are Damian Martinez and James Shea, who have yet to make a first-team appearance for the Emirates Stadium side, and Wenger would prefer to continue to assess the pair rather than throw one of them into the dead end.
By Gareth McKnight