Lance McCullers Jr. is returning to the Astros rotation this weekend. Houston's acting manager Joe Espada said Wednesday that the right-hander is slated to make his season debut on Saturday against the Oakland A's. McCullers hasn't pitched since he suffered a strained flexor tendon mass near his forearm in the ALDS last October. The 28-year-old has made four minor league rehab starts and will now join the team's rotation.