Today, Marcum told reporters that he has been given a cortisone shot in his shoulder each of the last three spring trainings. However, unlike last season, he expects this year's shot will force him to skip just one turn through the rotation this spring.
He said, though he has some discomfort and tightness, his MRI revealed no structural damage in his shoulder.
"I'd rather miss three days of spring training than miss a week or two during the season," he said, according to ESPN.
Sandy Alderson later told reporters the cortisone shot was precautionary, and Marcum is expected to resume throwing in a couple of days. Terry Collins also downplayed the situation, saying he expects Marcum to return to Grapefruit League action on March 25 or 26.