Steve Clarke wants to sign the defender, who played 13 games on loan at Getafe last season, on a similar temporary arrangement.
Fernandez is thought to be keen to push for a place in Argentina’s World Cup squad, but is not expected to be a major part of Rafa Benitez’s plans at Napoli.
The Italian club would supposedly consider selling him if they could make a profit on the 24-year-old they signed for £2.5million from Estudiantes in 2011.
In Argentina, Fernandez made 78 appearances for Estudiantes before his move to Europe. Since, he has appeared 28 times for Napoli and 14 times for Getafe.
He is also no stranger to the set up of his national side, having featured 18 times for Argentina.
His strongest abilities are said to be his tackling and heading. Indeed, both his first goals for Napoli were headers, scored in the same Champions League game away at Bayern Munich in 2011.
Fernandez would join Goran Popov as a loanee for the Baggies, who extended his stay from Dynamo Kiev for another year earlier this month.
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