in a penalty box, in a 1–0 loss against Sandnes Ulf on 28 April 2013. Having served his suspension, Reginiussen returned to the starting line-up, in a 2–1 win against Tromsø on 8 May 2013. He scored his first goal of the season, scoring from a header, in a 2–1 win against Vålerenga on 25 May 2013. Reginiussen then followed up in the next three matches by keeping a clean sheet. He scored three goals throughout August, scoring against Sogndal IL, Strømsgodset and Sandnes Ulf. Reginiussen helped the side finish second place after Strømsgodset won their match in the last game of the season, with performance earned attention from the Norwegian media. In the Norwegian Football Cup Final against Molde, he scored the club's second goal of the game, as they lost 4–2. At the end of the 2013 season, Reginiussen went on to make thirty–seven appearances and scoring five times in all competitions. Ahead of the 2014 season, Reginiussen was one of the Rosenborg players willingly to take a pay cut in the wake of the club's budget cuts. At the start of the 2014 season, Reginiussen continued to retain his first team place, playing in the centre–back position and formed a partnership with Strandberg, as well as, his captaincy. He then scored his first goal of the season, in a 3–0 win against Orkla FK in the first round of the Norwegian Football Cup, followed up by scoring two goals in the next two matches against SK Brann and Sogndal IL. After missing one match, he returned to the starting line-up, helping the side keep a clean sheet, in a 2–0 win against Sandnes Ulf on 12 May 2014. Four days later on 16 May 2014, Reginiussen scored his fourth goal of the season, in a 2–1 loss against Stabæk. As captain, he acknowledged the club's recent performances in a number of matches in mid–May. His fifth goal of the season came on 13 July 2014, in a 2–2 draw against Vålerenga. Reginiussen helped the side win four UEFA Europa League Qualifying matches before being eliminated by Karabükspor through away goal. However towards the end of the 2014 season, Reginiussen found himself in a sidelined, which saw him suffered injuries and suspension. Despite this, he went on to make thirty–two appearances and scoring five times in all competitions. Shortly after, Reginiussen signed a four–year contract with the club,