Fuld played left field on Thursday. Johnson was available to pinch-hit.
"He still is a little bit stiff today," Rays manager Joe Maddon said. "It was not really wise to start and then have to take him out. We could [play] him later, if necessary."
But Maddon said he wasn't worried about it becoming an issue.
"It's not lingering," Maddon said. "It's just a little back stiffness. Once we get by that, we'll be fine."
Chris Vannini is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.