The reason most of them are still here is because they can't be got rid of for what Levy would deem a suitable transfer fee. Any of Gaz, Lloris, Serge, Doherty, Aurier, Sanchez, Toby, Dier, Foyth, Sissoko, Lamela, Lucas should/could be sold for the right price. Bale needn't be renewed and Dele/Winks could be on the chopping block as well, though I'd keep both.
Doubt we could get what Levy would want for Sanchez, Foyth, Sissoko, Lamela, Lucas in particular, and think most will very much want to stay at the club.