O'Flaherty (back) played catch Sunday and plans to throw off of a mound prior to Monday's game, Joe Stiglich of CSN reports. O'Flaherty's back tightened up during the team's off day Thursday, but he indicated that it's a problem he's experienced before, and it typically only lasts two or three days. He'll work off of a mound Monday in an attempt to test out the back, though manager Bob Melvin suggested O'Flaherty probably will not be available to pitch against the White Sox.