(Jamie Sabau / Getty Images)

First baseman Adam LaRoche exited the Nationals’ 15-0 loss to the Reds tonight in the seventh inning with stiffness in his back, an ailment he had received treatment for prior to the game.  Manager Davey Johnson said he would “probably” sit LaRoche on Saturday.

“I don’t know about that,” LaRoche said. “We’ll figure that out in the morning.”

LaRoche first felt the pain in his back Wednesday against the Marlins, on a chilly night at Nationals Park. LaRoche dealt with some back stiffness last season, but that was lower in his back than his current tightness.

“It’s not a sharp pain,” LaRoche said. “It’s just really tight. It’s located right in the middle, and it’s staying there, knotted up.”

For the season, LaRoche is 0 for 13 with three strikeouts. As Johnson noted before Friday night’s game, LaRoche has hit several balls hard without having any drop in.

Tyler Moore replaced LaRoche at first base. Moore popped out to shortstop in his first at-bat of the season.