On 2 September 2013, Alderweireld joined Atlético Madrid on a four-year contract for an estimated €7 million (£6.16 million) transfer fee. He played 12 matches as the club won La Liga; on 11 May, he headed his only goal of the season, an equaliser in a 1–1 home draw with Málaga in the penultimate round of fixtures, ensuring that Atlético remained in the title race. Alderweireld played the final seven minutes and extra time of the 2014 Champions League final for Atlético in place of Filipe Luís; the team was beating city rival Real Madrid 1–0 when he entered the field of play, but Atlético eventually lost 1–4.