Off the top of my head:
Jack Butland
Toby Alderweireld (doesn't he have a low release clause?)
Aubameyang (Dortmund were happy to sell at anything over £60m this summer)
£100-£120m (the price of 1 x Coutinho?) should bring them all in, and would be a huge improvement on what we've got now.
Toby Alderweireld next season will be playing in the best stadium in the world, in a team with some of the best young players in the country, for one of the brightest young managers in Europe, living in London and playing for a club we have finished ahead of about once in ten years.
Why on earth would he want to swap them for us.