"When you start talking injury-wise, you just want to make sure that physically, the guy is able to perform and he's not having any setbacks from a health standpoint," Porter said. "I'm not worried about any other aspects."
Maxwell's absence has meant more playing time for the struggling Jimmy Paredes, who is 5-for-40 with 16 strikeouts in his past 14 games. Paredes was called up on May 6 from Triple-A Oklahoma City to bolster Houston's outfield depth.
Porter said Maxwell's starting spot will be waiting for him upon his return to the Astros.
Jacob Thorpe is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.