Soria gave up a leadoff home run in the ninth to Nelson Cruz on Sunday to tie the game at 6-6. With two out, Elvis Andrus singled home Mike Napoli in the 7-6 Royals defeat.
It was Soria's fourth blown save in 11 chances. He has only one save since April 29.
Soria has never had more than three blown saves in a season prior to 2011 and has been an All-Star pick in two of the past three years. He has never struggled this mightily.
But if the Royals have a save situation Monday against the Angels, Yost says Soria will get the call.
"I'm not going to deny it's a struggle for him right now," Yost said after the loss Sunday. "He'll figure it out. He's an All-Star caliber guy."
Yost said Soria "is our best option" to close games.
Rookie righty Aaron Crow, who is from Topeka and was an All-Big 12 pitcher at Missouri, has been good, but he blew a save, too, Sunday, giving up a two-run homer to Michael Young in the eighth.
Yost said he thinks "it's a mistake" to mess around with the closer and other bullpen roles.
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