Valimaki, 19, also would need to leapfrog over older, more established pro prospects in Rasmus Andersson and Oliver Kylington.
He's not short on confidence, though, entering his second camp with Calgary.
"I just have to do everything I can to be as good as I can be come September and fight for a spot," Valimaki said. "Last year was my first games, especially preseason games playing against NHL guys. Now I know what to expect and how to play. It helps a lot now. I'm a little more confident."
According to Conroy, Valimaki has reason to be.
"The one thing in his mind … he wants to be on that team come October, but if he doesn't, to go to the American Hockey League isn't a bad thing," Conroy said.
"The one thing you don't want to do is rush a guy who is not ready. You want him to go on that right curve. Just watching him, his season and what he did in the [2018 IIHF World Junior Championship as Finland's captain], and his mental makeup…he acts older than he really is, he has that maturity already.
"I definitely see him playing (NHL) games next year at some point."