Santiago Casilla is struggling as the Giants closer, taking a blown save and a loss in each of his last two outings.
"He's inconsistent," broadcaster Mike Krukow said on KNBR Wednesday morning. "It's frustrating when your closer has some inconsistencies. And I think with him it's more mental than physical. And that's something that can be overcome.
"The bigger problem is the guys setting it up for him, because it's a mishmash every day. You don't have a guy who's that eighth inning guy. You don't have a guy who's a seventh inning guy. It's right there for the taking."
Two candidates on the roster to take on more high-pressure situations are righty Hunter Strickland and lefty Josh Osich.
"There is growth with those two guys," Krukow said. "I like their arms, they're big arms. But they need to get better."
Strickland, 27, is 2-0 with a 3.27 ERA in 27 games this year. He has struck out 24, walked six and given up eight home runs.
"He doesn't have a really great secondary pitch," Krukow said. "He's got a split finger fastball, but he doesn't use it. He's got a slider, but he's not using it properly. He's not getting strike one with it to create an 0-1 advantage. ... The fastball is fine. I just think he needs some other secondary pitches to get the hitter off of the fastball."
Osich, 27, is 0-1 with a 4.19 ERA in a league-leading 31 appearances. He has struck out 12, walked eight and given up five home runs.
"I think there's some inconsistencies with his command," Krukow said. "I think that needs to improve. I think he needs to start throwing more changeups, get people off the fastball. If you don't have great command of it, get 'em off that fastball."
One of the team's strengths in recent years that has helped lead to three World Series championships in five years, the Giants bullpen currently ranks 21st in the majors with a 4.05 ERA.