Berisha went on trial at Swedish side Kalmar FF in 2007, and this was made possible by Albert Bunjaki, who was the head coach of the unofficial Kosovo national team as well as being part of the coaching staff at Kalmar.
His trial was successful and he was offered a contract by the club, and he initially joined the under-19s side at Kalmar in January 2008 as he was considered too young and inexperienced for first team football at the time and was later during the 2009 season loaned out for a short stint with local Division II club Lindsdals IF to gain first team experience.
He impressed in the youth side and was eventually promoted to the first team ahead of the 2010 Allsvenskan, where he was initially regarded as backup to veteran goalkeeper and Kalmar legend, Petter Wastå.

His first taste of first team football came in the first game of the season on 13 March 2010 against IFK Göteborg, where he was an unused substitute in the 3–0 home loss.
He remained on the bench until the 9th game week on 28 April where he was handed his professional debut by Nanne Bergstrand against Örebro SK, in a game which his side won 4–1.
He experienced a run of 6 games in goal for Kalmar, and his side went unbeaten during these games.
Towards the end of the season he cemented his spot as the first choice goalkeeper with some impressive displays, losing just once during the 14 league games he played in, and keeping 7 clean sheets in the process.
He also featured in the semi-final of the Svenska Cupen against Hammarby, with the game going to penalties following a 2–2 draw.
Kalmar ended up losing 6–5 on penalties, as Berisha failed to save any penalties.

Berisha debuted for Kalmar on 28 April 2010 against Örebro SK and won 4–1.
After making fourteen appearances in his debuting season, he became Kalmar's starting goalkeeper.
Berisha scored his first goal for Kalmar against Cliftonville in the Europa League qualification rounds and scored his first goal in the Allsvenskan against champions Helsingborgs IF, scoring from the penalty spot in the 38th minute in 2012.
But the game resulted in Berisha's worst ever result, with the final score at 7–2.
Berisha became a penalty taker at Kalmar and would score all of his goals from the penalty spot.

Berisha played his last game for Kalmar against Halmstads BK on 1 September 2013 and scored from a penalty to give his team the 1–0 victory.

During his time at Kalmar, Club Manager Svante Samuelsson stated that Etrit had developed into a very good goalkeeper during his time at Kalmar, and had worked very determinedly along with the skilled goalkeeper trainer Donald Arvidsson.
Berisha was liked by the fans, especially in the 2013 season as he was the main factor in keeping the club at fifth place with a chance for winning the league.
Berisha went on trial at Swedish side Kalmar FF in 2007, and this was made possible by Albert Bunjaki, who was the head coach of the unofficial Kosovo national team as well as being part of the coaching staff at Kalmar. His trial was successful and he was offered a contract by the club, and he initially joined the under-19s side at Kalmar in January 2008 as he was considered too young and inexperienced for first team football at the time and was later during the 2009 season loaned out for a short stint with local Division II club Lindsdals IF to gain first team experience. He impressed in the youth side and was eventually promoted to the first team ahead of the 2010 Allsvenskan, where he was initially regarded as backup to veteran goalkeeper and Kalmar legend, Petter Wastå.
His first taste of first team football came in the first game of the season on 13 March 2010 against IFK Göteborg, where he was an unused substitute in the 3–0 home loss. He remained on the bench until the 9th game week on 28 April where he was handed his professional debut by Nanne Bergstrand against Örebro SK, in a game which his side won 4–1. He experienced a run of 6 games in goal for Kalmar, and his side went unbeaten during these games. Towards the end of the season he cemented his spot as the first choice goalkeeper with some impressive displays, losing just once during the 14 league games he played in, and keeping 7 clean sheets in the process. He also featured in the semi-final of the Svenska Cupen against Hammarby, with the game going to penalties following a 2–2 draw. Kalmar ended up losing 6–5 on penalties, as Berisha failed to save any penalties.
Berisha debuted for Kalmar on 28 April 2010 against Örebro SK and won 4–1. After making fourteen appearances in his debuting season, he became Kalmar's starting goalkeeper. Berisha scored his first goal for Kalmar against Cliftonville in the Europa League qualification rounds and scored his first goal in the Allsvenskan against champions Helsingborgs IF, scoring from the penalty spot in the 38th minute in 2012. But the game resulted in Berisha's worst ever result, with the final score at 7–2. Berisha became a penalty taker at Kalmar and would score all of his goals from the penalty spot.
Berisha played his last game for Kalmar against Halmstads BK on 1 September 2013 and scored from a penalty to give his team the 1–0 victory.
During his time at Kalmar, Club Manager Svante Samuelsson stated that Etrit had developed into a very good goalkeeper during his time at Kalmar, and had worked very determinedly along with the skilled goalkeeper trainer Donald Arvidsson. Berisha was liked by the fans, especially in the 2013 season as he was the main factor in keeping the club at fifth place with a chance for winning the league.
Etrit Berisha