Chase played for St. Louis for eight seasons over two stints, from 1989-94 and 1997-2000.
"I've been here from Day One, and our fans deserve this here," Plager said. "What our players went through this year, to be where they were and to be doing what they're doing now, I mean, yeah, I got emotional."
Blues forward Vladimir Tarasenko said he saw Chase crying in the hall.
"You know, it's almost making us cry too," Tarasenko said. "It's unbelievable to see these guys happy. … It gives us goose bumps."
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This is no less than the greatest season in Blues history and one of the most remarkable stories in NHL history, and the final chapter hasn't been written.
The Blues made the Stanley Cup Final in each of their first three seasons. But that was after the NHL doubled to 12 teams, the six new teams had their own division and one was guaranteed to make the Final. They were swept by the Montreal Canadiens in 1968 and 1969, by the Bruins in 1970.
Many considered the greatest moment in Blues history the "Monday Night Miracle," when they came back from down 5-2 in the third period and defeated the Calgary Flames 6-5 in overtime in Game 6 of the 1986 Campbell Conference Final.
"I hate using that," said Bruce Affleck, who played for St. Louis from 1974-79, held other jobs with the organization and is executive vice president. "Yes, the 'Monday Night Miracle' was special, but it really wasn't, when you think about it."