Ortiz, batting .300 with 24 home runs and 79 RBI, was a late scratch from the opener of Boston's day-night double-header with Tampa Bay on Tuesday with what was first called an illness. Later, it was announced he had bursitis and manager Terry Francona said after the second game his No. 5 hitter needs rest.
"He got an MRI and it showed the bursitis in his heel," Francona said. "We're going to get him out of his spikes for a couple of days, get him in a little bit of a walking boot, just to kind of alleviate some of the pressure."
As far as how long Ortiz will be out, Francona said, "We'll keep re-evaluating him, I'm sure, every couple of days, but we want to get him off that for a little while.
"It's not going to be a DL but we're going to have to keep him out there for a little bit and we don't know what that [length of time] is."
The Red Sox also played the doubleheader, which they split, without shortstop Marco Scutaro, out with back stiffness.