There's needs and ideals. You're confusing the two, I think.
I think we need a better centre half than Blind or Jones, one to partner Smalling. I think we need a proper Van Gaal #10 in the mould of Thomas Muller, one that can contribute goals and assists regularly from behind the striker. I also think we need another attacker, one that can challenge and compete with both Mata and Memphis for a first team role out wide. Perhaps the #10 I speak of could be both of those players.
Two or three players are really needed, for me. Plus I expect both Januzaj and Pereira to make more telling contributions next season.
I'd still love Harry Kane, for what it's worth. I'd bring him in and bin Rooney next summer given the option. But that is more of a want. Or a pipedream, to be frank.