The Blues lost two free agents: defenseman Michael Del Zotto, who did not play in a Stanley Cup Playoff game last season, signed with the Anaheim Ducks; and forward Pat Maroon, who signed with the Tampa Bay Lightning.
That leaves at least one forward spot open, which will be filled internally.
"Our young guys, they got to push the envelope here and come with a lot of energy early on in the season, that's going to be really important," Berube said. "We've got some young guys and some other players who will probably be fighting for a better spot in the lineup on a nightly basis, which is good, so I think we're going to have good competition in our group, which is good."
Blues general manager Doug Armstrong agreed.
"Younger players. Faster players," he said. "The game is evolving. The game is changing. We have to evolve and change. We have guys that want to hold their ice time, they want to hold their spot on the team. Guys on the team want to get a higher place in the pecking order of special teams. And younger players want jobs."