Armenteros was optioned to Triple-A Round Rock on Saturday, Chandler Rome of the Houston Chronicle reports.

Armenteros (1-1) struggled in his start against the Athletics on Saturday, giving up five earned runs off seven hits and one walk while striking out three over four innings as he was charged with the loss. The right-hander will return to Round Rock, where he carries a 5.05 ERA with a 72:28 K:BB over 71.1 innings this season. Brad Peacock is expected to be activated off the injured list in a corresponding move, Julia Morales of AT&T SportsNet Southwest reports.

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