Gunnarsson, who has been out of the lineup since suffering a season-ending ACL tear in March of last season, will play for the Rampage this weekend.
San Antonio plays Friday against the San Jose Barracuda and Sunday against the Chicago Wolves.
Gunnarsson will join Robby Fabbri and Nikita Soshnikov on conditioning assignments with the Rampage. All three players are expected to rejoin the Blues soon.