Barnes is 5-2 with 23 saves and a 2.30 ERA, but hadn't pitched since a save against the Toronto Blue Jays on July 28. The right-hander was put into quarantine after showing symptoms at the team's hotel here.
Marwin Gonzalez returned to the active roster after being out since July 13 with a hamstring strain. He is hitting .205 while starting at all four infield positions, as well as left and right field.
Information from The Associated Press was used in this report.