George Lombard Jr., the Yankees’ 21-year-old rookie shortstop, exited Saturday’s game with right knee discomfort after a check swing, but evaluations found no structural damage and he remains day-to-day with inflammation in the patella. While not ruled out for the rest of the series or the season’s critical stretch, Boone and team officials caution that swelling and discomfort must clear before he can return, potentially affecting the Yankees’ lineup as they chase divisional and wild-card positioning.