Koss went 2-for-4 with an RBI, a run scored and two steals in Sunday's 6-4 loss against San Diego.
Arozarena went 3-for-5 with two homers and four total RBI in Sunday's 8-7 loss to the Athletics.
Munoz (5-6) blew the save and took the loss Sunday against the Athletics. He allowed two runs on two hits and no walks while striking out one over two-thirds of an inning.
Miller did not factor into the decision Sunday, allowing two runs on two hits, five walks and a hit-by-pitch over five innings against the Athletics. He struck out five.
Giants manager Tony Vitello said Sunday that the Giants will have a conversation about whether to shut Webb down for the remainder of the campaign, Alex Pavlovic of NBC Sports Bay Area reports.
Devers (abdomen) is expected to undergo season-ending surgery Tuesday, Alex Pavlovic of NBC Sports Bay Area reports.
Young is out of the lineup for Sunday's game against the Athletics.
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.
