Andrew Miller limped through the visiting clubhouse in a walking cast, stopping periodically to grimace. X-rays on the reliever’s left foot late Saturday night were inconclusive and he’ll return to Boston for further tests with noted orthopedist Dr. George Theodore. But the Red Sox saw enough to know that Miller won’t be pitching anytime soon, which is why they placed the left-hander on the 15-day disabled list yesterday and replaced him with right-hander Alfredo Aceves. Miller was injured in the seventh inning of Saturday’s loss to the Angels when he stepped awkwardly while trying to change direction and back up home plate. He said he hopes nothing is broken, but added that he won’t know for sure until he undergoes further tests. “It’s pretty sore,” Miller said before last night’s 3-0 loss. “I can’t really put any weight on it or anything. I’m going to fly back to Boston, find out more, and hopefully get it taken care of sooner rather than later.” Miller described what happened Saturday night after he had allowed a single up the middle to J.B. Shuck.