Gunnarsson (upper body) has been ruled out on a week-to-week basis, Jeremy Rutherford of the St. Louis Post-Dispatch reports.
Analysis:
Gunnarsson suffered the injury during Saturday's game in Los Angeles, causing him to exit after playing just 6:12. With both Gunnarsson and Jay Bouwmeester set to miss extended periods of time, expect newly recalled Chris Butler to remain with the club for at least the near future.