if Chelsea have learned from previous mistakes they won't sell the lad. He looks a talent, granted he's not the finished article but he's a very good player and he's now an England International. If they sell him now for 30m (which is more than he's worth in reality but the current market is mental) then there is every chance they'll be cursing it further down the line if he then moves to a massive club for seriously big money. Their best option is to loan him out again. Palace was fine place to start but he now needs the next level, to play for a team looking to break into Europe. After that they can determine if he's the sort of player to contribute to a title challangeor sell him on.