Sosa, a seven-time All-Star, is listed as day to day. The injury
is not related to a lower back injury Sosa suffered earlier in the
season, which put him on the disabled list May 19 through June 18.
The Cubs had their last three games postponed with the Florida
Marlins at Miami due to Hurricane Frances, and haven't played since
Wednesday's 2-1 victory at Montreal.
Sosa has used the time off to receive treatment on his hip.
"He's had it the last few days and we treated him during the
workouts," Cubs trainer Dave Groeschner said. "It's getting
better, it's not 100 percent yet, so we will continue to treat him
and hopefully possibly tomorrow he will be back in the lineup."
Sosa is hitting .259 with 29 home runs and 85 RBIs this season.
Sosa wasn't sure how he injured the hip, but he played through
it in Montreal and it gradually became more sore.
Ben Grieve started in Sosa's place in right field. Grieve was
acquired from Milwaukee on Aug. 31 for a player to be named. He's
hitting .261 with seven home runs and 29 RBIs.