That's the thing though, you already have a damn good young roster that you've brought in. I don't see many gaps where you'll need to recruit.
Right now our team has next to nothing in terms of depth in the midfield. When we have to sit one of our first XI we have guys like Benayoun playing. We have been beyond fortunate that Mata, Hazard, Oscar etc... have not gotten injured with all the games we have played this year so it hasn't been as big of an issue as it could have been but there is no way we can go into next season without bolstering our depth.
With that said, we do have several players out on loan right now that we should have never sent off so bringing them back may be an answer but I'm not sure how many of them are ready to perform at the level of what Chelsea needs/expects.