The Blues are one win from the first Stanley Cup championship in their history.
The forward, who has been sidelined since Game 1 with an undisclosed injury, took part in his first full practice Saturday since before Game 3 of the Western Conference Final. Thomas has been on the ice since but primarily late during practices or on his own.
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"Yeah, he was out there today and we'll see tomorrow, for sure," coach Craig Berube said. "It's a game-time decision. Obviously, he's been a very good player for us for a long time, and we'll see."
Thomas, who has six points (one goal, five assists) in 20 postseason games, was skating in his regular spot on right wing with center Tyler Bozak and left wing Pat Maroon.
"Good, good. He's been working hard to get back in the lineup, so we'll see tomorrow if he plays," Maroon said. "Obviously it's always good to see the kid out there skating around. He's been just itching to get back out there with the guys, so it's good to see him out there."
Center Brayden Schenn agreed.
"I don't know if he's playing tomorrow or not, but he's been skating off and on, he's working hard off the ice to get back," Schenn said. "We'll see if he's ready. Obviously, he has incredible skill, he's an unbelievable player. We'll see if he's ready."
The Blues' lineup is fluid going into the game. Forward Ivan Barbashev was suspended one game by the NHL Department of Player Safety on Friday for an illegal check to the head of Boston's Marcus Johansson in Game 5 and will miss Game 6. Forwards Vladimir Tarasenko and Alexander Steen received maintenance days and did not practice Saturday, though both were at the rink, Berube said.
Tarasenko's wife, Yana, delivered the couple's third child, a boy, on Friday evening.
Robby Fabbri skated in Tarasenko's spot on right wing with Schenn and left wing Jaden Schwartz, and Jordan Nolan took Steen's spot with Sammy Blais and Oskar Sundqvist.
"Some of the decisions will be made tomorrow, either in the morning or game time," Berube said. "But yeah, I've said it a lot: we have good depth, which is very important on the back end and up front. A guy like [Zach] Sanford coming in and doing a good job for us after being out for some time, and Sammy Blais, just different guys. It's really important."
