Devers (abdomen) is expected to undergo season-ending surgery Tuesday, Alex Pavlovic of NBC Sports Bay Area reports.
The Giants placed Devers on the 60-day injured list Sunday due to a core muscle injury.
The Giants selected Bandura's contract from Triple-A Sacramento, and he's batting fifth as the designated hitter Sunday against the Padres.
Cavanaugh went 1-for-3 with a solo home run in Saturday's 7-6 loss to the Padres.
Devers went 1-for-4 with a two-run home run in Saturday's 7-6 loss to San Diego.
Whitcomb went 1-for-3 with a solo home run in Saturday's 7-6 loss to the Padres.
Gilbert went 2-for-4 with a two-run home run and an additional run scored in Saturday's 7-6 loss to the Padres.
Perdomo (0-1) took the loss Saturday, coughing up five runs on 10 hits and two walks over 4.2 innings as the Giants were downed 7-6 by the Padres. He struck out three.
Tatis went 2-for-3 with three walks, a solo home run and two stolen bases in Saturday's 7-6 win over the Giants.
Merrill went 1-for-4 with a walk and a solo home run in Saturday's 7-6 win over the Giants.
