Petersen is still dealing with soreness in his right forearm after being struck by a comebacker during his relief appearance in Sunday's 5-3 loss to the Padres, Jordan McPherson of the Miami Herald reports.
Petersen avoided any structural damage to his forearm but the resulting bruise is still presenting some discomfort for the right-hander. The Marlins are treating him as day-to-day and could look to stay away from him in the first game or two of their series with the Phillies this week.