SBNation.com has a long transfer deadline preview that goes team by team through the Premier League. Here's what Callum has to say about Chelsea:
They need: After taking a machine-gun approach to the transfer window this summer, Chelsea have somehow managed to build a squad that lacks a proper midfield. Frank Lampard continues to decline, John Obi Mikel continues to divide opinion, Michael Essien appears to have vanished off the face of the earth, and Ramires is too ill-disciplined to operate without a foil. All of Chelsea's other midfielders have to play further forward, which leaves them with the untested Oscar. They shouldn't struggle for goals, but they may struggle to control games against better teams.
They'll get: It's unlikely Chelsea will get anyone after the money they've spend in this window. No midfielders have been linked, which suggests that the club are either happy to go into battle with what they have, or Roberto di Matteo has a masterplan up his sleeve.
... and I more or less agree with that. There're 19 other teams in there, so check it out.