Swansea have followed the signing of Jose Manuel Flores from Genoa with the acquisition of Jonathan de Guzman on a season-long loan from Villarreal.
Manager Michael Laudrup made defender Flores the first addition to his squad since succeeding Brendan Rodgers and he has now added former Dutch U-21 international De Guzman ahead of the Swans' second English Premier League campaign.
Both players previously worked with Laudrup at Mallorca and De Guzman is looking forward to being re-acquainted with the Dane at the Liberty Stadium.
He told the club's official website: "Once the opportunity came along to join Swansea and Michael Laudrup it was a done deal. I didn't have to think twice about it."
De Guzman added: "I watched Premier League football every week on the TV last season. I was aware that Swansea are a good footballing side, but they really caught my eye when they beat Manchester City.
"They had a great season and I am really looking forward to the challenge of playing on a new [stage] in the Premier League. I'm grateful for the opportunity and grateful that the manager has acknowledged me as a player."