Rivera pulled out of next week's game in Anaheim because of nagging injuries. Major League Baseball added Soriano on Wednesday.
Gallardo was put on the 15-day disabled list this week with a left oblique strain. NL All-Star manager Charlie Manuel chose Bell since he had also chosen Gallardo.
It's the first All-Star selection for Soriano, who is 2-0 with a 1.65 ERA and 23 saves in 24 opportunities this season, and the second straight All-Star selection for Bell, who was the loser in last year's game. He is tied for the NL lead with 23 saves. He is 4-0 with a 1.72 ERA.
Information from The Associated Press was used in this report.