Last year, Sizemore suffered the same injury in mid-February and was participating in full baseball activities by September. He should be on a similar schedule this time around, with rehab perhaps spilling into the offseason.
Should the infielder's rehab go smoothly, he should be at 100 percent by the start of Spring Training.
Between now and then, the A's will continue to rely on the second-base platoon of Eric Sogard and Andy Parrino, with several other options hanging around in Triple-A Sacramento, including Jemile Weeks and Grant Green. Rehabbing infielder Adam Rosales (intercostal strain) can also play the position.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.