Rafael Lucas Cardoso dos Santos (born 5 February 1998) is a Brazilian professional footballer who plays as a left-back for Major League Soccer club St. Louis City SC. Career Santos developed in the academy of Mirassol, making his senior debut for the club on 2 July 2017 in the 2017 Campeonato Paulista, playing the full 90 minutes against Ferroviária in a 2–1 defeat. He scored his first goal on 27 August 2017, the opening goal in a 4–2 win over Penapolense in the same competition. In 2018, he joined Cruzeiro, initially on loan. He made 27 appearances for the club's under-20 team including in the 2018 U-20 Copa Libertadores. On 14 August 2018, Santos made his first team debut for the club as a 76th-minute substitute for David in a 2–0 Série A defeat to Vasco da Gama. Having joined Cruzeiro permanently in 2019, Santos went on loan for spells with Chapecoense, Inter de Limeira and Ponte Preta in Série B and later with Coritiba in Série A. He made a combined 106 senior appearances while in Brazil in all competitions. On 5 January 2023, Santos joined Major League Soccer club Orlando City ahead of the 2023 season on a two-year contract with an additional two club option years. On 20 May, Santos scored his first goal for the club in a 3–1 win at Inter Miami with the help of an assist from Duncan McGuire.