Michaels, who was activated Thursday after having a partial separation of his left shoulder, went 6-for-20 with Triple-A Oklahoma City, and he said upon rejoining the Astros on Friday that his shoulder was fine.
He was the designated hitter for two games and then played in the outfield.
"Everything was good," he said. "It was fun to get out there and play and get some at-bats. I thought it saw some good pitching. The guys on the team were fun."
Michaels has struggled at the plate with the Astros following a hot spring. He's 2-for-11 as a starter and was 0-for-6 with a walk as a pinch-hitter entering Friday's game. He hopes the consistent at-bats in Triple-A will pay off with the Astros.
"I was able to work on some stuff and tweak some stuff, and get consistent pitches and make some adjustments," he said. "I'm confident and am going to go up and try to have good at-bats."