Despite the new position, there's already familiarity between Yeo and Sydor. The coach previously served as an assistant alongside Yeo for five years with the Minnesota Wild and one season with the AHL's Houston Aeros.
"I am excited to have Darryl back on my coaching staff," said Yeo. "He was an outstanding leader during our time in Minnesota and will add a wealth of experience and knowledge to our team." The adjustment to the new roster should be comfortable as well, as Sydor has coached or played alongside a handful of current Blues.
He spent last season as an assistant with the Chicago Wolves. That Wolves team included familiar names such as Jordan Schmaltz and Ivan Barbashev, who both saw playing time with the Blues.
Prior to making the move behind the bench, Sydor played one season with the team in 2009-10. That roster included Patrik Berglund, David Perron, Alex Pietrangelo, and Alexander Steen.
Sydor skated in 1,291 NHL games between 1991-2010. The defenseman registered 507 points (98 goals, 409 assists) and 755 penalty minutes in that span. Additionally he played in 155 postseason games, helping his team capture the Stanley Cup in 1999 (Dallas) and 2004 (Tampa Bay).