William Saliba in training. Image source, Getty Images
Image caption,

William Saliba has returned to first-team training for Arsenal.

ByAlex HowellArsenal reporter

Arsenal boss Mikel Arteta will soon have a big defensive dilemma.

But it is one that will be both welcome to the Arsenal boss and the envy of other top teams across the continent.

That's because William Saliba - a key figure in the Gunners' title win last season - is back in training, having missed the entire campaign so far because of a back injury following his early withdrawal in France's World Cup semi-final loss to Spain.