McDonagh (upper body) is not available for Monday's game against the Panthers, Erik Erlendsson of LightningInsider.com reports.
McDonagh will miss his second straight game with an upper-body issue. The 31-year-old defenseman will likely be ready to play once the postseason begins. He finishes the 2020-21 season with 12 points and 96 blocked shots in 50 games.