De Los Santos was outrighted to Triple-A Indianapolis on Saturday.
De Los Santos is still just 25 years old, but he hasn't done enough to entice a team to claim him off waivers. In 65.1 career major-league innings, most of which have come in relief, he owns a 6.06 ERA, though his 27.7 percent strikeout rate in 35.1 frames this season hints at some small amount of potential despite his 6.37 ERA.