The achilles injury is why I would like to see another CB in the squad next season, instead of Gabriel.
Holding, Koscielny, Mustafi, Monreal + another CB and the opportunity to use Mertesacker and Kolasinac as emergency options.
A taller and commander CB is what we need to build a strong and solid defense. I'm loving what Holding, Musta, Monreal and Kos are doing, but are tackler, aren't specialist with aerial duels. We suffer tall and positional players like Crouch, especially during a corner or a free kick.
This is why I was in favour to sign a type of player like Pepe, using him as Juventus are using Dani Alves.