Brandon McCarthy will retire at the end of this year after a 13-year Major League career.

McCarthy hopes to return to the Atlanta Braves out of the bullpen this season. He's been sidelined since June 24 with a knee injury.

"I'm done after this," McCarthy said. "This is it. The offseason is the rest of my life. If I was going to keep playing, a month and a half ago, I would have had the surgery that cleans the [knee] and I'd be back next year just a little bit after spring [training]."

The 35-year-old is making a mechanical adjustment in his delivery to decrease the stress on his knee.