The St. Louis Blues have traded defenseman Pierre-Olivier Joseph to the Pittsburgh Penguins, parting him from his brother Mathieu Joseph. This trade was executed just before the NHL's holiday roster freeze, allowing the Blues to create salary cap space.

Pierre-Olivier Joseph, who began his NHL career with the Penguins, has struggled this season with limited ice time and a minus-seven rating. The trade comes after the Blues acquired Mathieu Joseph, uniting the brothers temporarily.