The 20-year-old righty, the youngest player in the majors for most of the season, gave up just two unearned runs and seven hits over five innings on Saturday to get the win in a 7-5 victory over the San Francisco Giants.
On the season, he is 2-7 with a 5.02 earned run average over 15 starts for the Astros.
"To be clear, this is not a demotion," said Astros manager Ed Wade said. "We're extremely pleased with the way Jordan has handled himself this season. His innings pitched total is approaching the limit we had set for him."
Lyle will pitch out of the bullpen in Oklahoma City and it was stated by Wade that he expects to call up Lyles once again when rosters expand in September.
Prior to Monday's game in Colorado, Houston will make a corresponding move with the team expecting to activate outfielder Jordan Schafer off the 15-day disabled list. He was acquired from the Atlanta Braves as part of the Michael Bourn trade on July 31 and is batting .533 during his rehab assignment with Oklahoma City.