[16] After nearly two months in the NHL, Sikura was reassigned to the IceHogs on April 2 to help the team qualify for the 2019 Calder Cup playoffs.

[19] On January 5, 2020, Sikura recorded his first career NHL goal against the Detroit Red Wings to clinch a 4–2 win.

[20] On September 28, 2020, Sikura was traded by the Blackhawks to the Vegas Golden Knights in exchange for Brandon Pirri.

[21] On July 29, 2021, having left the Golden Knights organization, Sikura was signed as a free agent to a one-year, two-way contract with the Colorado Avalanche.

[22] After attending the 2021 Avalanche training camp, Sikura was assigned to AHL affiliate, the Colorado Eagles, to begin the 2021–22 season.

In a first-line offensive role with the Eagles, Sikura established career highs to finish sixth in league scoring with 33 goals and 40 assists for 73 points in just 60 regular season games.

Sikura remained a part of the Avalanche black aces squad through the remainder of the playoffs, as the club went on to claim the Stanley Cup.

[23] In his return to the Blackhawks, Sikura rejoined former AHL club the Rockford IceHogs for the 2022–23 season, and collected 12 goals and 32 points through 52 games.

As a free agent, Sikura left Sweden and was signed to a one-year contract with Russian club, Traktor Chelyabinsk of the KHL, on June 7, 2024.