However, the start of the 2020 season was pushed back to June due to the pandemic. Reginiussen were among Rosenberg players to agreeing to take a pay cut as a result of the pandemic. Following the departure of Jensen, he resumed his role as the club’s captain. Reginiussen captained his first match in almost a year, starting the whole game and helping Rosenberg kept a clean sheet, in a 0–0 draw against Kristiansund in the opening game of the season. Since the start of the 2020 season, he continued to establish himself in centre–back position, forming a partnership with Hovland and Eyjólfsson. Reginiussen helped the club kept three clean sheets in three matches between 5 July 2020 and 16 July 2020. A month later on 27 August 2020, he scored his first goal of the season, scoring from a header, in a 4–2 win against Breiðablik to advance to the next round of the UEFA Europa League. Reginiussen then scored his second goal of the season, once again scoring from a header, in a 3–1 win against Molde on 13 December 2020, in what turns out to be his last appearances for Rosenberg. Despite missing a total of four matches during the 2020 season, he went on to make twenty–nine appearances and scoring two times in all competitions.