Can't see us keeping Jander. He's a £30m player and I don't think we'll be able to turn down offers like that.
Leo is a funny one. Would be a hell of a gamble for a PL side and he might be too flaky at that level.
If we could keep Leo, Azaz, Stewart, Matsuki, Robinson, Fellows, Bragg, Wood, Stephens, Bree, Manning/Wely we'd have something to build round.
Obviously we'd need to sort GK position, add a CB, add to CM (assuming Charles and Jander off, and maybe Downes) and another striker. But with decent loans that's not massively unrealistic.
Key is to get an experienced and competent management team in place ASAP.