Sivert Heltne Nilsen, the midfielder hailing from Norway, was born on the 2nd of October, 1991. He currently plays for Aberdeen, primarily as a central defensive midfielder. Standing at six feet tall (1.84m) and weighing in at 12st 3lb (78kg), he dons the number 6 jersey for his team. According to Transfermarkt, Nilsen's current market value is around £340k. With a contract set to expire on 30 June 2027, he still has a considerable tenure left at Aberdeen.
Nilsen's career began in earnest in January 2009, when he joined Hødd in Norway's OBOS-ligaen. In January 2014, Nilsen switched his allegiance from Hødd to Valerenga, also in Norway's Eliteserien, where he made a total of 41 first-team appearances across two seasons.
In July 2015, Nilsen moved from Valerenga to Brann in the Eliteserien for an undisclosed fee. Over a period of four years, he made a substantial contribution to the squad with a whopping total of 116 league match appearances, during which he netted 17 goals.
In July 2018, he continued his journey from Brann to AC Horsens in Denmark's 1st division. In his time with AC Horsens, he made 27 first team appearances, scoring once before moving to IF Elfsborg in Sweden’s Allsvenskan in August 2019.
After making 33 appearances and scoring twice for IF Elfsborg, Nilsen transferred to Waasland-Beveren in Belgium's Derde Klasse in January 2021 for approximately £340k. After making nine first-team appearances, Nilsen returned to Norway's Eliteserien, this time to his previous club Brann, in August 2021. His second stint at Brann saw him once again making an impressive contribution to the team with 106 starts and 16 goals in four seasons.
In July 2024, Nilsen crossed borders once again, this time to Scottish football, transferring from Brann to Aberdeen for a fee of around £255k. Currently, in the 2024-2025 season, he has racked up 26 first team appearances. Additionally, he has been a part of Aberdeen's campaigns in the League Cup and the Scottish Cup, securing six and two starts in each competition respectively.
Throughout his career, Nilsen has been a consistent figure in his teams, showing a blend of endurance, strategic play and scoring ability in each competitive season, irrespective of his current club.