The Colorado Rockies on Friday optioned right-handed pitcher Eddie Butler to Triple-A Albuquerque and placed left-handed reliever Boone Logan on the 15-day disabled list, according to MLB.com's Dargan Southard.

Relievers Ken Roberts and Gonzalez Germen were recalled from Albuquerque in corresponding moves.

Butler on Thursday continued a string of poor starts at the major league level, allowing six runs on seven hits in four innings in a 12-3 loss to the New York Mets. Butler owns a 5.90 ERA with 42 walks and just 44 strikeouts in 79 1/3 innings this season.

Logan's DL stint, the result of inflammation in his left elbow, is retroactive to Aug. 12. Logan's three-year, $16.5 million contract signed with the Rockies prior to the 2014 season has been disastrous; the 31-year-old southpaw has posted a 5.69 ERA while allowing 11.1 hits and 4.4 walks per nine innings in 55 1/3 frames spanning two seasons. Right-handed batters have been particularly problematic for Logan, whose OPS against in those situations is .937, compared to .883 a year ago.

Roberts rejoins the Rockies for the first time since May, when he went on the DL following an eight-game stretch with the big league club. Roberts allowed five runs on 12 hits in nine innings during that time.

Germen, acquired from the Chicago Cubs via waiver claim in July, allowed six runs on 12 hits and six walks in an 11 2/3-inning stint with the Rockies from July 10 through Aug. 3.