I'm really, really not convinced of him tbh. He's extremely slow and doesn't seem too strong either. Potentially just a good body-in-the-way type defender. Like a more limited Jags.
Not a terrible thing to be but he's clearly been asked to lead out backline and he's not done a great job of it.
Would like to see a van dijk / koulibaly / de ligt type next to him. Ball player who can defend on the front foot, and allow Keane to drop back and be a reasonably comfortable deep cb who can head long balls, which I think he would excel at.