Just a point. Remember our usual port of call (Portugal/Europe) isn't going to be as easy now. Players have to have a certain amount of points to be eligible for transfers here. That will mean premium prices for the ones that have the points.
South America is much easier, but i don't think there's a glut of world class defenders there.
Getting them from the UK is infinitely more expensive, as it's always been. I think we have the defenders at the club. They need to play together. Dion Sanderson is a great prospect. It's whether he can do it at PL level. Only playing him will we find that out.