Everybody who just barely follows the club could tell those names. I don't think anyone will buy Aogo and I don't think it matters. He will be gone after this season. Getting rid of Di Santo or Sam would be pretty good, especially Di Santo because his contract is the longest one and he is probably the only one for which you could get some money. Nobody will pay anything for Sam with his injury history and Caicara... I don't know. He is a big tactical liability but I think he could be useful if used in the right way. He also looks beneficial for the atmosphere of the team, being always happy and always putting in a lot of effort. Although that isn't a valid reason by itself for keeping him.