Sisco, 25, came to the White Sox via a trade with Kansas City for Ross Gload on Dec. 16, 2006, and the southpaw was counted as an integral part of the White Sox bullpen in the early part of the 2007 campaign. But Sisco struggled with an 8.36 ERA over 19 games, walking 11 in 14 innings, and did not receive a September callup after being sent down on May 27.
While Sisco will be out of action for the foreseeable future, the news was positive on Wednesday concerning second baseman Danny Richar and outfielder Jerry Owens. Richar, who was placed on the disabled list during Spring Training with a fracture of his first left rib, is feeling good but still a couple of weeks away from any sort of baseball activity.
Owens, sidelined by a partial right adductor tear, should begin a Minor League rehab assignment this weekend.
Scott Merkin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.