Marcus Åke Jens-Erik Nilsson (born 26 February 1988) is a Swedish football manager and former player who played as a centre-back.
Born in Rydebäck, Sweden, Nilsson played for his hometown club, Rydebäcks IF, before joining Helsingborgs in 2003 at thirteen. After progressing through the ranks at Helsingborgs, Nilsson was called up to the first team and was involved in the first team pre-season matches. It wasn't until on 1 May 2007 when Nilsson was given a first team chance by then Manager Stuart Baxter, where he made his first start and played 70 minutes despite losing 1–0 against Elfsborg. With two appearance in the 2007 season, Nilsson signed a contract with the club in September 2007.
The 2008 season saw Nilsson struggling to make a breakthrough in the first team, with the likes of Joel Ekstrand, Andreas Granqvist and Samir Beloufa established himself in the central defense position. Following the departure of Granqvist and the arrival of Hannu Patronen, Nilsson then made his first appearance of the season on 7 July 2008, where he made his first start in a year, in a 1–1 draw against Göteborg. From July to October, Nilsson had a handful of first team appearances and formed a central defense partnership with youngsters, Ekstrand. Despite a good performance against Kalmar FF on 24 September 2008, Nilsson, however, was demoted to the substitute bench for the rest of the season.