Outfielder Magglio Ordonez, who returned from the disabled list two weeks ago, will be sidelined at least four weeks with bone marrow edema in his left knee.
The four-time all-star was also on the shelf from May 26-July 8 with torn meniscus in the same knee that required surgery.
Magglio Ordonez has bone marrow edema in his left knee. (AP File Photo)
Chicago (50-42) entered Friday's action a half-game behind the division-leading Minnesota Twins (52-43) with about nine weeks left in the season.
Ordonez is expected to be on crutches for the next four to eight weeks, with only a swimming exercise regimen. He will be re-evaluated by team physicians after four weeks to determine whether he can begin a rehab program.
Ordonez, 30, is batting .292 with nine homers and 37 RBIs in 52 games this season.
Chicago recalled outfielder Joe Borchard from triple-A Charlotte to replace Ordonez on the active roster.
