Cape Town - Newcastle United signed defender Federico Fernandez from Swansea City on a two-year contract just before the transfer window closed on Thursday.
The 29-year-old centre-back reportedly cost the Magpies around £6 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."
The Argentina international became a target for Newcastle after they failed to bring in Barcelona's Marlon Santos due to a failed work permit.
Fernandez, who played for Napoli before joining Swansea, made 30 Premier League appearances for the Swans last season.