"His timing's a little off," manager Brad Ausmus said. "It's not quite where it was."
Prior to the break, the 35-year-old Martinez was sidelined for the better portion of two weeks with back and side soreness.
Ausmus talked to Martinez following Saturday night's loss, and the designated hitter reported feeling fine. He started at first base Sunday for the first time this month.
Matt Slovin is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.