The Marlins appear as though they’re going to have to consider Plan B in center field — for the early part of spring training at the very least. Justin Ruggiano, the favorite to win the starting job entering camp, has a strained lower back, according to manager Mike Redmond, who isn’t sure how long Ruggiano will be out. “He’s getting treatments,’’ Redmond said. “We’re going to have to [list it] as day-to-day, see how that progresses. “It’s always a concern when you get a guy that’s banged up early in spring training. Being that it’s so early, though, I’d rather have it now than two weeks left in spring training. But at the same time, too, those backs can be touchy.” In the meantime, the Marlins have plenty of options to look at in center, Redmond said. Gorkys Hernandez, acquired from the Pirates last season in the Gaby Sanchez trade, will get the first start of the spring Saturday against the Cardinals.