Federico Fernandez admits Michu convinced him about moving to Swansea City.
Fernandez's arrival at Swansea from Napoli will bolster manager Garry Monk's centre-back options, which currently include captain Ashley Williams, Jordi Amat and Kyle Bartley.
"It has always been my dream to play in the Premier League - it is the best in the world - and I'm grateful to Swansea for giving me this opportunity," Fernandez told the club's official website.
"I asked Michu and Jordi Amat about the club. I obviously trained with Michu at Napoli, and while I was on loan at Getafe (in 2013) I played with (former Swansea loan player) Alvaro Vazquez. He is very good friends with Jordi, so I've spoken to them too.
"Michu told me it is a family club and the city is very relaxed. He said I was joining a very good club. All I've heard are good things about Swansea."
