This is at least somewhat knee-jerk so feel free to ridicule now or in the future when proven wrong.
I'm getting sick and tired of watching how poor he's on the ball. He has other flaws, but this one stands out as one that will be very difficult to improve on. In fairness it looks worse next to Alderweireld and Vertonghen who are in different ways excellent footballers, but he's just not at the level required.
Perhaps we can build around that weakness. Vertonghen or Alderweireld and in the future another top notch ball player next to him. Get rid of central midfielders that aren't up to scratch on the ball, same with full backs, a goalkeeper with good distribution, always playing a target man.
I just don't understand why we spent that kind of money on a young player with such an obvious weakness. We can spend years improving him only for him still to fall short, or for his very presence to dictate our transfers and lineups for years to come. He can't even head the ball accurately.
Right now I'd happily see us sell him and losing money if anyone would pay up. He's got great talent, I just don't think he has what we need.