William Saliba is expected to miss Arsenal's Premier League clash with Leeds as the defender continues to recover from a back injury.
The Frenchman has started all but one of Arsenal's league games this season, forming a strong partnership with Brazilian Gabriel.
But Saliba was forced off early in the Gunners' Europa League defeat by Sporting after tweaking his back.
The nature of his problem means it remains uncertain exactly when he will return to Arsenal's title tilt.
He missed their final game before the international break - a 4-1 win over Crystal Palace - and then pulled out of the France squad.