PITTSBURGH — 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.