The move comes after back-up goalkeeper Rafael Cabral suffered a season-ending knee injury against Swansea City last Thursday.
And with concerns over the fitness of first-choice shot-stopper Pepe Reina, the Serie A club have opted to add squad depth by securing Doblas' services until the end of the campaign.
A statement on Napoli's website confirmed: "Toni Doblas has signed a contract that keeps him at Napoli until 30 June 2014 after passing a medical."
The Spaniard links up with Rafael Benitez's side after having his contract with Azerbaijani side Khazar Lankaran terminated in July last year.
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