Reimer will guard the road goal against the Red Wings on Sunday, per Jackson Starr of the Senators' official site.
Reimer will make his Ottawa debut in the second half of the team's back-to-back after Leevi Merilainen played in Saturday's 6-5 overtime loss to Montreal. The 37-year-old Reimer went 10-10-2 with a 3.04 GAA and an .896 save percentage in 24 regular-season appearances between Anaheim and Buffalo in 2024-25.