Michalek (concussion) was acquired by the Blues on Monday in exchange for a prospect and a future draft pick, Sarah McLellan of the Arizona Republic reports. Michalek is facing an uncertain return date after sustaining a concussion in mid-February, but his acquisition by the Blues suggests the team feels confident he might not be out for too much longer. The Blues have been struggling a bit defensively since Kevin Shattenkirk underwent abdominal surgery, but Michalek's impending arrival should at least give the blue line an added shot-blocking presence. However, don't expect Michalek to come close to matching Shattenkirk's output in the scoring categories, as he managed just eight points in 53 games with the Coyotes before succumbing to the head injury.