"We don't think it's anything serious," Mattingly said. "But we want to be extra cautious, especially with the schedule we've got, we don't want anybody pushing it and winding up with something worse. Just like Zach, Brandon is feeling better and he's moving closer to getting back on the mound."
League said backing off is just "precautionary." He said he threw eight bullpen sessions before arriving in Arizona, more than usual in anticipation of the compressed training camp.
Lee, meanwhile, said he also plans to throw off a mound Wednesday. He strained a lat muscle doing pull-ups at last month's pitching mini-camp.
Tyler Emerick is an associate reporter for MLB.com. Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.