New York Islanders defenseman Mike Reilly, 31, will undergo a heart procedure on Tuesday that will sideline him indefinitely, the team announced on Monday, and the veteran didn't know he had a condition until it was found during testing for a concussion.

The New York Islanders have been without a couple of key players throughout 2024-25, and the team was dealt another disappointing blow on Monday. Veteran defenseman Mike Reilly, who hasn’t been in the lineup since a 4-3 victory over the Buffalo Sabres on November 1,

Defenseman Alexander Romanov, who has missed the past seven games and 10 of 11, is still day to day after sustaining an upper-body injury against the Sabres. He is a game-time decision when the Islanders (7-7-4) visit the Calgary Flames on Tuesday (9 p.m. ET; SN1, MSGSN).