Middle linebacker Rolando McClain continues to work himself back into playing shape. As expected with a player who sat out all of last season, the Dallas Cowboys are being cautious with McClain’s workload. Since being acquired in a trade with Baltimore last month, McClain has quietly gone about his business at training camp. Although he wasn’t ready to participate in the season opener and will likely not play Saturday against Baltimore, McClain could be on the field for the Cowboys’ final two preseason games. “We’ve decided to let him get back into playing shape by, of all things, playing football,” Cowboys owner Jerry Jones said Tuesday on 105.3 The Fan [KRLD-FM], “rather than be out there with our injured players, doing a lot of exercise, a lot of running, a lot of strength and conditioning. We put him right in, almost from Day 1. We think that’s good.