A second magnetic resonance imaging exam on Phil Hughes?s left ankle revealed a Grade III sprain, indicating a torn ligament. Hughes will not be allowed to throw off a mound for about six more weeks, though General Manager Brian Cashman said the Yankees have ruled out surgery. ?He can walk on it, and it doesn?t look all that bad,? Cashman said. ?But it is what it is. They?ve got him in a boot. He?s been throwing with a boot on it. But it?s going to push him back, because he?s not going to be able to throw off a mound.? Cashman said Hughes?s hamstring was almost fully healed when he injured the ankle doing conditioning drills last Friday. Hughes?s timetable would make it unlikely that he could return before August.