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Juan announced his retirement after winning the 2019 Campeonato Carioca and played his farewell match on 27 April 2019, in Flamengo's 3–1 win over Cruzeiro.

On 11 November 2015, Juan and Internacional agreed to cancel his contract by mutual consent, almost a month later on 8 December 2015, Juan confirmed his return to Flamengo.

Having begun his career with Flamengo, he spent a decade playing in Europe in service of Bayer Leverkusen and Roma before returning to Brazil with Internacional in 2012.

In the 2011–12 season, he usually played alongside Gabriel Heinze. He scored his seventh goal for Roma in a 5–1 win over Cesena on 21 January 2012. He scored again in Roma's 4–2 loss Cagliari in Sardinia, followed by his third goal of the season, and the opening goal, in Roma's 4–0 demolition of Internazionale at the Stadio Olimpico. He scored nine goals for Roma during his time there.

On 16 July 2012, Roma and Juan agreed to cancel his contract by mutual consent, which was set to end on 30 June 2013. On the same day, Juan signed a two-year contract with the club of Porto Alegre Internacional, with a one-year option.

On 28 June 2010, Juan scored the first goal against Chile with a headed finish from a corner as Brazil won 3–0 to advance to the quarter-finals of the 2010 FIFA World Cup.

Juan played for Roma between 2007 and 2012. In all competitions for Roma he scored 11 goals in more than 140 appearances. With Roma he won one Coppa Italia and Supercoppa Italiana. He was a first-choice centre-back for Roma, and wore the number four jersey. Juan scored his first goal for Roma against Reggina on 16 September 2007.

Juan played on Brazil's Copa América-winning teams in 2004 and 2007, also winning the FIFA Confederations Cup in 2005 and 2009. He scored the winning goal in the penalty shootout at the end of the 2004 Copa América Final against Argentina in Lima. In the quarter-finals of the same competition in 2007, he opened the scoring in a 6–1 thrashing of Chile in Puerto La Cruz.

Juan played for six years for Flamengo in Brazil. In 2002, he moved to Bayer Leverkusen. He played five years in Germany scoring ten goals for Bayer. In 2007, he moved to Roma for €6.3 million.

Juan Silveira dos Santos (Portuguese pronunciation:  [huˈɐ̃ siɫˈvejɾɐ dus ˈsɐ̃tus] ; born 1 February 1979 in Rio de Janeiro), commonly known as Juan, is a Brazilian retired footballer who played as a central defender.