Laurent Koscielny is back in full training for Arsenal.
The French defender has been missing for almost two months, his last game for the club being in the defeat to Chelsea at Stamford Bridge.
Arsenal face Borussia Dortmund in the Champions League on Wednesday night, hoping to close the gap on the group leaders to two points.
The Gunners have sorely missed him in recent weeks, shown in their 3-3 home draw in the last game against Anderlecht, with Nacho Monreal featuring in defence instead.
They suffered another calamitous mix-up against Manchester United with Kieran Gibbs and Wojciech Szczesny colliding, leading up to conceding a goal, which likely would not have happened with Koscielny marshalling the backline.