Smalling has home grown status helping him, but tbh CB will be a hotly contested position that United would be stupid to sell. Chelsea need a new CB or 2, United need one and City probably need 2 based on the fact that Nastatic is going and Demicheles is 34, we need 1, Liverpool need a whole new back 4 from the looks of it...
Having Jenk back will lower own home grown requirement so I can see him staying next sesason, adding a young squad player like Crowley will help it meaning we'll only really need one or two more spaced over 4 years.