DENVER -- Retaining some left-handed bullpen depth in the organization, the Giants announced Wednesday that Erick Threets had cleared waivers and was outrighted to Triple-A Fresno.

Threets, 26, has missed most of this season with a strained muscle in his right side. He made the Giants' Opening Day roster and was 0-1 with a 3.60 ERA in seven appearances before going on the disabled list April 18.

Since Threets was out of Minor League options, the Giants had to place him on waivers before trying to send him to Fresno once he completed his injury rehabilitation assignment. Any team claiming him would have had to keep him in the Majors, perhaps explaining why nobody picked him up.

"We're glad we still have him in the organization," said manager Bruce Bochy, who proceeded to detail the improvements Threets must make to return to the Majors. "He needs to get better at all the peripherals -- handling himself on the mound, holding runners and fielding bunts, along with getting command of all his pitches."