"I'm not sure who (a save chance) will go to," Hinch said, "but it most likely won't go to Ken tonight."
Hinch informed Giles of his decision after the right-hander's poor performance Saturday in a 6-2 setback to the Los Angeles Dodgers that evened the series at two wins apiece.
"He wasn't surprised," Hinch said. "He understands, and he wants to be there for his teammates."
Giles has allowed at least one run in six of his seven appearances in the postseason. The 27-year-old has surrendered three homers among 12 hits and five walks in the playoffs for an inflated 11.74 ERA over 7 2/3 innings.
Giles was taken deep by Yasiel Puig to lead off the 10th inning in Game 2 before permitting an RBI single to Enrique Hernandez. Giles faced three batters without recording an out in a tie game in the ninth inning of Game 4.
"He's tough enough to handle it. He's got weapons to handle it," Hinch said of Giles. "This is a big stage. He wants to do well, like everybody does, and having to live it out on this stage has been a little bit of a grind for him. Got to have a short memory as a closer, no matter what. If we need him to get critical outs, he's going to come in and give his best."
As for alternatives, Hinch's best option among the team's relievers could be Chris Devenski. He also employ starting pitchers in a late-game role, as he did with Brad Peacock in Game 3 of the World Series and with Lance McCullers Jr. in Game 7 of the American League Championship Series against the New York Yankees.