Marcos Jeferson Farias Valentim (born 29 January 1982), also known as Nguyễn Trung Sơn, is a Brazilian former footballer who played as a midfielder.
Career Valentim played for Brazilian side União Rondonópolis in 2005 before signing for Brazilian side Vila Aurora in 2006. One year later, he signed for Vietnamese side SHB Da Nang. In 2008, he signed for Vietnamese side Quang Nam FC. Two years later, he signed for Vietnamese side Becamex Binh Duong.
Subsequently, he signed for Vietnamese side Quang Nam FC, where he made twenty league appearances and scored zero goals. Following his stint there, he signed for Vietnamese side Dong Thap FC, where he made twenty-five league appearances and scored zero goals.
Personal life Valentim was born and raised in Brazil, where he had a wife and children. He later became a naturalized Vietnamese citizen and married a Vietnamese woman. After retiring from professional football, he worked at a hotel in Brazil.
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