Pitcher Chris Tillman expects to throw his next bullpen session tomorrow and said he came off the field this morning "as a precaution" after experiencing some back spasms.
"I could have participated 100 percent today," he said.
Tillman said he fell asleep on a couch yesterday, which might have caused the tightness in his back. He's experienced spasms in the past.
Tillman didn't fall behind the other pitchers, since this wasn't his day to throw.
Brad Bergesen made 35 throws off flat ground today. He's scheduled to repeat the session on Tuesday and Thursday, and could return to the mound by the weekend.
"Everything's good," he said. "It's been better every time."
Outfielder Nolan Reimold is a full-go in camp after undergoing Achilles surgery. He isn't being restricted in the early days of camp, though manager Dave Trembley said the club "will use common sense."