What is Fiorentina's greatest position of need?

Paulo Sousa has been brilliant thus far in leading Fiorentina (expected to scrap for a Europa League place) to second place at midseason. After losing Vincenzo Montella and a number of his stalwarts and big signings, the Portuguese mister has schemed la Viola into a well-oiled attacking machine, something both ruthless and attractive.

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But there are definitely some shortcomings in the squad, particularly in terms of depth. Fiorentina's ignominious defeat at the hands of Carpi in the Coppa Italia may be something of a blessing, as it spares Sousa the headache of competing on three fronts. However, to really push for the top three--or Scudetto--will require some investment by the Della Valles.

Daniele Pradè has played it typically close to the vest, although the myriad central and right-sided defenders linked to the club over the past several months are a clear indication of his focus (related: check out our coverage of transfer rumors here). However, we've also heard rumors of midfielders, wide men, attackers, and even the odd goalkeeper. So, here's your open forum: what's the main position of need? What are the secondary shortcomings? Where on the field are things pretty well set, thank you very much?