Mackey was assigned to AHL Hartford on Tuesday.

During his latest stint with the Rangers, Mackey earned two shots on goal, two blocked shots, two hits and four PIM in three games. He has five goals and 15 points in 52 AHL appearances this season.

Samuelsson (illness) was absent from Tuesday's practice, Rachel Lenzi of The Buffalo News reports.

Samuelsson still could be available for Wednesday's game against Boston. He has accumulated 12 goals, 39 points, 97 shots on net, 137 blocked shots and 110 hits across 68 appearances this season. If Samuelsson can't play versus the Bruins, Luke Schenn or Michael Kesselring could draw into the lineup.

Pulock (lower body) won't be in the lineup against Chicago on Tuesday, per Stefen Rosner of NHL.com.

Pulock was on the ice briefly before the team's morning skate and will miss his second straight game. He has compiled three goals, 22 assists, 80 shots on net and 125 blocked shots across 67 appearances this season. Adam Boqvist will remain in Tuesday's lineup due to Pulock's absence.

Gostisbehere (lower body) won't play against Montreal on Tuesday, according to Patrick Friolet of RDS.

Gostisbehere will miss his ninth straight game, and it remains unclear when he will be available to return. He has generated 11 goals, 43 points, 98 shots on net and 50 blocked shots across 45 appearances this season.

Rielly (lower body) will be back in the lineup against Boston on Tuesday, per Luke Fox of Sportsnet.

After sitting out Saturday's 5-2 loss to Ottawa, Rielly will return to a top-four role and should see time on the power play against the Bruins on Tuesday. He has accounted for nine goals, 33 points, 125 shots on net and 96 blocked shots across 67 appearances this campaign.

Yakemchuk was recalled from AHL Belleville on Tuesday.

Thomas Chabot (right arm) and Lassi Thomson (lower body) were injured in Monday's 2-1 win over the Rangers, which necessitated Yakemchuk as well as Jorian Donovan being brought up from the minors. The 20-year-old Yakemchuk has yet to make his NHL debut but was the No. 7 overall pick in 2024. With Belleville this season, the right-shot blueliner has accounted for 10 goals, 36 points and a minus-30 rating over 50 appearances.

Head coach Travis Green stated after Monday's 2-1 win over the Rangers that Thomson (lower body) will be out for a while, according to Julian McKenzie of The Athletic.

Making his first appearance in the NHL since the 2022-23 campaign, Thomson logged two shots in just 4:25 of ice time before being unable to finish Monday's contest. Thomas Chabot (right arm) is also set for an absence, leaving the Senators extremely shorthanded ahead of a crucial divisional matchup in Detroit on Tuesday. Green said that two defensemen will be elevated from Ottawa's minor-league affiliate ahead of the team's second half of a back-to-back.

Head coach Travis Green said after Monday's 2-1 win over the Rangers that Chabot (right arm) will be out for a while, Julian McKenzie of The Athletic reports.

Chabot joins a growing list of injured Ottawa defensemen, as the team currently has only four healthy players on the blue line. Green relayed that two players from AHL Belleville will be brought up ahead of Tuesday's divisional matchup in Detroit. More information on Chabot's timeline for a return to the lineup may not be available until the team returns to Ottawa.

Thomson (lower body) has been ruled out for the remainder of Monday's road game against the Rangers.

Thomson left Monday's game midway through the second period. He was the second blueliner for Ottawa to depart the contest, as Thomas Chabot left the game late in the first period due to an injury to his right arm. With the Senators playing the second half of a back-to-back Tuesday, Thomson will likely carry the questionable tag until further information is provided. If he can't go Tuesday, the Senators will likely weigh the option of calling up the 20-year-old defenseman Carter Yakemchuk, who is one of the top prospects in their minor-league system.

Chabot has been ruled out for the remainder of Monday's road game against the Rangers due to a right arm injury.

Chabot was cross-checked by J.T. Miller at the end of the first period. Lassi Thomson (lower body) was also injured Monday, leaving the Senators with four defensemen for the rest of this game against the Rangers. The Senators play in the second half of a back-to-back Tuesday in Detroit, so Chabot should be considered questionable, at best, for that matchup at this time.