Markus Karlsson (footballer, born 2004)

Markus Carl Olof Karlsson (born 20 January 2004) is a Swedish professional footballer who plays as a right back or centre-back for Hammarby IF in Allsvenskan.

Early life
Born and raised in Stockholm, Karlsson started to play youth football with local club Hammarby IF in 2009, at age five. In 2021, Karlsson was part of the side that finished second in P19 Allsvenskan, after a 2–1 loss to IFK Göteborg in the national final. The team also competed in the 2021–22 UEFA Youth League, getting knocked out by Rangers in the first round through 1–5 on aggregate.

Hammarby IF
On 22 December 2021, Karlsson signed a three-year deal with Hammarby, running until the end of 2024, his first professional contact. In 2022, he mostly played for feeder team Hammarby TFF in Ettan, Sweden's third tier, making 19 league appearances.

On 25 February 2023, Karlsson made his competitive debut for Hammarby, coming on as a substitute in a 3–0 away win against Norrby IF in Svenska Cupen. On 25 May 2023, he made his league debut in Allsvenskan, starting as a right back away against Degerfors IF and scoring 0–1 with a left-footed shot in the top corner in a game that would end 2–2. On 10 August 2023, after establishing himself as a starter in the first team, Karlsson signed a new four-and-a-half-year contract with Hammarby, running until the end of 2027.

International career
Between 2019 and 2022, Karlsson was called up to the Swedish under-17's and Swedish under-19's

Karlsson was called up to the Sweden national team for the training tour in Cyprus in early 2024.