The Argentine played under Newcastle manager Rafael Benitez before joining Swansea, when the latter was in charge of Italian side Napoli.
"I know Federico well... and it was an easy decision to bring him here," Benitez told Newcastle's website https://www.nufc.co.uk/news/latest-news/magpies-sign-defender-fern%C3%A1ndez. "He is experienced, a very good professional and he will add competition in defence."
Neither club disclosed the fee paid for the 29-year-old, but local media reported it to be in the region of 6 million pounds ($7.7 million).
"It was a long day but I'm really happy to be here," Fernandez said. "It's a new challenge in my life and I'm very excited to meet all the players and staff here."
(Reporting by Simon Jennings in Bengaluru, editing by Ed Osmond)
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