William Saliba's absence from the back line represents a serious worry for Arsenal as the Premier League title race enters the final furlongs.
The French centre-half has been everything Gunners fans hoped he would be this season - and much more besides.
There was dismay among the fanbase when Saliba, 22, was sent out on three separate loan spells in France after he was signed from Saint-Etienne in 2019.
But Mikel Arteta wanted to make absolutely sure the towering defender was fully ready for the rigours of Premier League football and this season he has proved conclusively that he is.