Watford expect to ratify the signing of Mauro Zarate from Fiorentina by Monday.
The former West Ham and QPR forward arrived in London for a medical on Saturday and is likely to sign on an initial loan with view to permanent £2.5million deal and a three year contract.
The 29-year-old has scored four goals in nine appearances for Fiorentina this season.
Zarate was first introduced to English football back in 2008 when he completed a short loan spell with then top flight side Birmingham City.