The Ottawa Senators will be without their captain for the fifth straight game.
Brady Tkachuk was not included in the team's projected lineup for Tuesday's matchup with the Columbus Blue Jackets.
The 25-year-old was deemed doubtful by head coach Travis Green on Sunday after Ottawa's 3-0 win over the Florida Panthers.
Tkachuk last played on March 30 against the Pittsburgh Penguins and has been out with an upper-body injury since. It is not known exactly how he sustained the injury.
Tkachuk also missed a pair of games with a lower-body injury coming out of the 4 Nations Face-Off in February.
The left winger leads the Senators with 29 goals this season, adding 26 assists in 71 games.
Ottawa is sitting comfortably in the first Eastern Conference wild-card spot with a 42-29-6 record, five points ahead of the Montreal Canadiens, who hold the second wild-card spot.
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