Houston Astros closer Josh Hader said Saturday he does not expect to pitch again during the regular season after being diagnosed with a left shoulder capsule strain. The six-time All-Star, placed on the 15-day injured list earlier in the week, plans three weeks of rest followed by rehabilitation that would effectively rule him out through September, although he has not ruled out returning for the playoffs. Hader, 31, has converted 28 of 29 save opportunities while posting a 6-2 record and a 2.05 ERA over 48 appearances. Houston began the weekend holding a half-game edge over the Seattle Mariners in the American League West. In a separate setback for another contender, the Philadelphia Phillies placed ace right-hander Zack Wheeler on the 15-day injured list after doctors discovered a blood clot near his right shoulder. General Manager Dave Dombrowski said no timetable has been set for Wheeler’s return as the pitcher undergoes further testing in Philadelphia. Wheeler, 35, is 10-5 with a 2.71 ERA and a major-league-leading 195 strikeouts, and had thrown five innings against Washington the night before reporting discomfort. The Phillies expect to activate veteran Aaron Nola on Sunday to help stabilize a rotation now missing its Cy Young runner-up.