Armstrong first reached out to Yeo in 2010 when the Blues were looking for a coach for their American Hockey League affiliate in Peoria, but Yeo opted for the job in Houston, the Minnesota Wild's AHL affiliate.
Yeo spent the past five seasons as Wild coach before being fired on Feb. 14 and replaced by John Torchetti. Yeo led Minnesota to a 173-132-44 regular-season record and three Stanley Cup Playoff appearances. The Wild eliminated the Blues in the Western Conference First Round in 2015.
"I thought all the situations that were available were great, but when Doug and I started talking, this quickly jumped to the top of my list and my family's list as far as places to live, the markets to be in," Yeo said. "But I want to win, and I feel this is a place with the ownership, with the management, with the coaches, with the players, I really believe that it's a place that I can come and be successful.
"On top of that, I'm 42 years old, I've had a good amount of experience behind me. I've had a decent run in Minnesota. But I'm not looking to be a decent coach. I'm looking to be a great coach and I think the opportunity to work with a guy like [Hitchcock], to have that opportunity to learn in the group before you jump into that coaching position, I just felt like this was a perfect fit and that's why I was so excited about it."
Hitchcock said he is 100 percent certain the transition will work out for the best.
"I'm confident in my abilities," Hitchcock said. "I'm not afraid of that responsibility. I've been dealing with one-year contracts since the second year I was here. None of that stuff scares me one bit.
"This is something smart for the organization. We have a responsibility, a stewardship for the future of the organization. This is the best-case scenario for the future of the organization. For allowing a coach to come and be a part of it moving forward so he learns the lay of the land and to have the clear understanding of expectations. ... It fit and it fit really well.
"I'm really comfortable with it. I know Mike is. I know he's going to help me get better and I know I'm going to help him get better. If Mike gets enough information from me and enough knowledge, then he can be a coach for 20 years and have real success. That's my goal, to help the team now but also to leave it in great shape for the future."