"All good," said Morgan, who went 2-for-3 and stole two bases against the A's on Tuesday. "It was an unfortunate little incident but I'm fine now."
Morgan was hit in the top of the first inning on Saturday and stayed on base and took the field in the bottom of the frame before coming out as a precautionary move in the second inning.
On Tuesday, he was slotted in the No. 2 spot in the lineup and played right field.
"He does a nice job defensively," manager Ron Roenicke said. "Whether we put him in center or right."
Morgan said he felt fine on Sunday, but said Major League Baseball has been playing close attention to head injuries and he felt there was no need to rush back to action.
"I would have definitely played the next day, but it was March 10," Morgan said. "So we were just being safe."