Trout missed games Saturday and Sunday in Oakland because of stiffness in his back. He left after the first inning in a game Tuesday night against the Astros at Minute Maid Park after the back pain returned.
That prompted the Angels to send Trout, 22, to a doctor in Houston for the MRI exam Wednesday.
"The MRI was clean, it was just some inflammation in my mid-left back," Trout said. "It's definitely good news."
"I'm not going to do much today, probably just going to throw and see if I can hit in the [batting] cage," he said. "[I'll] see how I feel tomorrow and maybe go tomorrow."