The Padres have designated righty Kevin Quackenbush for assignment and outrighted lefty Dillon Overton, Dennis Lin of the San Diego Union-Tribune reports on Twitter. Those moves help clear the way for a variety of September call-ups.
San Diego has selected the contract of right-hander Jordan Lyles and activated shortstop Erick Aybar from the DL. The club also added lefty Kyle McGrath and righty Jose Valdez to the active roster.
Quackenbush has never quite replicated the success he found in his debut season of 2014 and struggled to a 7.86 ERA over 26 1/3 major-league frames this year. Lyles was also effective in ’14 as a starter for the Rockies, but has steadily declined ever since and washed out of the Colorado bullpen earlier this year.