Nationals general manager Mike Rizzo said Sunday that he's "not overly concerned" about Gio Gonzalez (shoulder), but the club won't know more until the results from an enhanced MRI are known. The Nats went ahead and placed Gonzalez on the disabled list because he wasn't going to be available for a while after having dye injected into his shoulder before the MRI. The hope is that he's only dealing with inflammation, but more should be known following Sunday's game. Blake Treinen is expected to take Gio's spot in the rotation.