Agent: Grady Sizemore had surgery

Free agent Grady Sizemore underwent microfracture surgery on his right knee in September, his agent confirmed to MLB.com, meaning the three-time All-Star might not be ready for a major league game until the middle of the season.

Sizemore previously had microfracture surgery on his left knee in 2010. He gave the Cleveland Indians a boost upon his return in April 2011, but was limited to 71 games after sustaining a knee injury that May. He didn't play at all in 2012.

Sizemore's agent, Joe Urbon, told the website this surgery was "a lot less invasive."

"He has a good mindset," Urbon told MLB.com. "He knows what to expect and what each step brings."

Sizemore, 30, has spent his entire major league career to date with the Indians.