Giants manager Tony Vitello said Monday that "there's a chance" Mayer (forearm/foot) returns before the end of the season, Alex Pavlovic of NBC Sports Bay Area reports.
The Giants optioned Roxby to Triple-A Sacramento on Monday.
The Giants recalled Abner from Triple-A Sacramento on Monday.
Gilbert is not in the lineup for Monday's contest against the Cardinals.
Brubaker (ribs) resumed a throwing program over the weekend, MLB.com reports.
Cavanaugh is not in the lineup for Monday's game against the Cardinals.
Mautz struck out one batter and allowed three hits and one walk over two innings of relief in Saturday's 10-7 loss to the Rockies.
Herrera went 3-for-5 with a double, two RBI and two runs scored in Sunday's 10-8 win over the Rockies.
Burleson went 3-for-5 with a double, one RBI and one run scored in Sunday's 10-8 win over the Rockies.
Soriano allowed a hit and struck out one without being charged for a run over one-third of an inning to earn the save in Sunday's 10-8 win over the Rockies.
