Gattis told the Atlanta Journal-Constitution that he had arthroscopic surgery in his right knee to remove a "dime-sized bone chip."
Gattis said that the chip has been floating around in his knee since around 2006.
“The doctor did a really good job,” Gattis said. “I came back good. But I had a fragment floating around for, like, the last seven years. So I had that cleaned out, just smoothed it out.”
Gattis had a breakout season in 2013, only batting .243, but hitting 21 home runs and driving in 81 runs.