Sundqvist has missed eight games with a lower-body injury after being hurt on Jan. 27 in Vancouver.
Without Sundqvist in the lineup, the Blues went 2-4-2.
In 44 games this season, Sundqvist has 11 goals and nine assists (20 points).
To make room on the roster for Sundqvist's return, the Blues have assigned Troy Brouwer to the San Antonio Rampage.