Feb. 14 11:35 AM PT12:35 PM MT1:35 PM CT2:35 PM ET14:35 ET19:35 GMT3:35 CST12:35 PM MST2:35 PM EST3:05 PM VEN23:35 UAE1:35 PM CT-Balfour is scheduled for arthroscopic surgery on his right knee Thursday afternoon. The A's made the announcement that the right-hander is expected to miss four to six weeks, and decided to have the procedure now with the hopes of returning for the start of the season. Analysis: The 35-year-old Balfour went 3-2 with a 2.53 ERA and 24 saves last season for the AL West champions. The A's exercised their $4.5 million contract option for the Australian reliever shortly after the team lost in a five-game division series to the Tigers.