|Full name||Carlos Jorge Marques Caldas Xavier|
|Date of birth||26 January 1962|
|Place of birth||Lourenço Marques, Mozambique|
|Height||1.76 m (5 ft 9 1⁄2 in)|
|1986–1987||→ Académica (loan)||26||(1)|
|* Senior club appearances and goals counted for the domestic league only|
Born in Lourenço Marques, Portuguese Mozambique, Xavier began his professional career with Lisbon-based Sporting Clube de Portugal, already being a regular first-team fixture at age 19. He played 23 Primeira Liga games as the Lions won the title in the 1981–82 season, which would be the last until 2000.
In 1991, after more than 250 competitive appearances, Xavier moved, alongside compatriot and teammate Oceano, to Spain's Real Sociedad, where the pair was equally influential, having been reunited with former Sporting boss John Toshack at the La Liga side.
Both Xavier and Oceano returned to Sporting in the summer of 1994, and the former played two more years before retiring at the age of 34. In the 2004–05 campaign he had a brief spell at coaching, assisting at another club from the capital and the top division, G.D. Estoril Praia.
- "Toshack acusa de indisciplinados a los jugadores de la Real" [Toshack accuses Real players of indiscipline]. El País (in Spanish). 19 September 1992. Retrieved 28 July 2016.
- "25 años, 71 extranjeros" [25 years, 71 foreigners] (in Spanish). Noticias de Gipuzkoa. 23 April 2015. Retrieved 28 July 2016.
- "Carlos Xavier: "O futebol desiludiu-me"" [Carlos Xavier: «Football let me down»] (in Portuguese). Sábado. 6 December 2015. Retrieved 10 February 2018.
- "Portugal é campeão do mundo de futebol de praia" [Portugal are beach soccer world champions] (in Portuguese). Tribuna Portuguesa. July 2015. Retrieved 10 February 2018.
- "Gémeos com carreiras lideradas pelo futebol" [Twins with careers led by football]. Diário de Notícias (in Portuguese). 22 September 2007. Retrieved 10 February 2018.