Arsenal boss Arsene Wenger is ready to go with a back five to stiffen his defence.
The Daily Mail says Wenger planned on making the switch for last week's Champions League clash against Schalke after his side's defensive troubles during the 2-1 defeat against Manchester United.
The Frenchman held a training-ground meeting to discuss the idea with his coaching staff.
It was eventually decided there was not enough time to implement the system on the training field ahead of the clash in Gelsenkirchen.
But it is understood the change of formation is still very much in the forefront of Wenger's thoughts as his side continue to struggle defensively.