The 24-year-old has signed a four-year contract and joins the Spanish fee for a fee believed to be around €7million.
“I wanted to sign for one of the best club’s in Europe,” he told their official website.
“I’m happy to be a part of this club.”
Alderweireld has also been linked with the likes of Bayer Leverkusen and Liverpool this summer.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?