McCann was accidentally poked in the right eye by happy teammate Michael Bourn after crossing the plate.
"It was just in the moment," said McCann, who was able to remain in the game after getting eye drops. "I'll take that every day to get a grand slam."
Still, there was concern about how the catcher might feel when he woke up Thursday morning.
"I was very happy," said McCann, who had no swelling or redness in the eye.
A trip to the eye doctor before coming to Turner Field confirmed that everything was OK.
"I've got a scratch on the outside of the eye," McCann said. "Just a little discomfort. I'm fine."
McCann wasn't in the lineup for the series finale against the Phillies due to the fact it was his scheduled day off. David Ross made the start behind the plate for the Braves.