Michael Laudrup's men have confirmed the central defender will arrive at the Liberty Stadium, subject to a medical and international clearance, on a four-year deal
The central defender has signed a four-year deal with the Capital One Cup winners, subject to a medical and international clearance.
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The Spaniard becomes the Swans' second signing of the summer, following Jose Canas' free transfer from Real Betis.
Michael Laudrup's continues to seek further bolstering of his squad, with a second loan-long deal spell for Villarreal midfielder Jonathan de Guzman looking close to completion.
However, club captain Ashley Williams is edging closer to a summer exit after agreeing terms with Arsenal.