"Sue [Falsone, head athletic trainer] didn't think it was anything serious," said Mattingly. "I'm leaning toward being cautious. I don't want to push it to the point of him missing three or four days."
Mattingly said reliever Matt Guerrier reported continued improvement in his lower back injury. Guerrier continues to play catch on flat ground and it's not clear if he will be ready for Opening Day, although he said he expects to be back on a mound within a week.
Mattingly also said he hasn't made any changes to the work schedule because of bad weather approaching the Phoenix area.
"We can't worry too much," he said. "If it comes, it comes and we'll adjust on the fly. It's not going to kill anybody if we miss a day. We've got the cages. We can hit and throw in there."