At 25 , Nacho will be the senior of the centre - backs , despite being four years Varane 's senior .
Senior lacks the experience the Frenchman has , and that could be senior 's undoing on Saturday .
At 25 , Nacho will be the senior of the centre - backs , despite being four years Varane 's senior , but he lacks the experience the Frenchman has , and that could be Nacho 's undoing on Saturday .