PITTSBURGH (AP) -- The Pirates placed second baseman Neil Walker on the 15-day disabled list prior to Friday night's game against the Washington Nationals due to an injured right hand.
Pittsburgh also selected the contract of veteran right-hander Jose Contreras and recalled infielder Jordy Mercer from Triple-A Indianapolis and optioned right-handed reliever Jared Hughes to the same club.
The move with Walker is retroactive to April 27 and the Pirates are hopeful he will be ready to be activated May 12. He is hitting .253 with one home run and eight RBIs in 23 games.
Brandon Inge is expected to make the majority of starts at second base in Walker's absence.
Contreras, 41, was signed to a minor-league contract as a free agent Feb. 23 and made six relief appearances in the Pirates' farm system, allowing three earned runs in seven innings for a 3.86 ERA.