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Tatar, 27, took part in line rushes as a left wing and worked on the second power-play unit during the optional morning skate at Bell MTS Place. Forward Oscar Lindberg skated with the scratches. Second-line left wing David Perron did not skate.
Vegas coach Gerard Gallant said his lineup would be a game-time decision.
Tatar, acquired from the Detroit Red Wings on Feb. 26 for three draft picks, including a first-round selection in the 2018 NHL Draft, has been scratched from the past three games. He has not played since Game 4 of the Western Conference Second Round against the San Jose Sharks on May 2.
He has no points in four playoff games but had 34 points (20 goals, 14 assists) in 82 games with the Golden Knights and Red Wings in the regular season, including six (four goals, two assists) in 20 games with Vegas. Nine of his goals this season came on the power play.
"He's scored goals in the past and he's getting a chance here, and hopefully he runs with it," Vegas forward James Neal said. "Whether he's on [the power play] or not, I think he does a great job of getting open, and he's been in that place throughout the year and he has done a good job of putting the puck in the net."
