Santana has pitched just five times since the start of July, allowing nine runs in 5.2 innings.
The 38-year-old's recent work has given manager Mike Matheny little reason to trust him, but Santana has still seen an unusually light workload. The veteran right-hander allowed a walk in a scoreless inning Sunday versus Toronto. It was the first time he didn't allow a run since June 18. He's pitched to a 5.75 ERA, 1.35 WHIP and 31:14 K:BB through 40.2 innings this year, mainly in a low-leverage role.