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08/23/09 3:54 PM ET

Sore left knee sidelines Cubs' Soriano

Johnson not expected to return until early September

LOS ANGELES -- Cubs outfielder Alfonso Soriano was not in Sunday's lineup because of a sore left knee that he said bothers him when he runs.

Sam Fuld, who made a spectacular catch Saturday in left field, slamming into the gate face-first, started in left in Soriano's spot. Soriano also has been struggling at the plate, batting .116 (5-for-43) in his past 12 games but said Sunday the knee hasn't been a factor.

"Running is a problem," Soriano said Sunday.

Reed Johnson, on the disabled list since July 30 with a fractured left foot, apparently won't be back until early September. X-rays taken late last week showed that the bone had not fused as well as hoped.

"It's going to be a little longer," manager Lou Piniella said Sunday. "We thought he'd be ready this [coming] week, but think it'll be the first of September."

The Cubs will get one player back from the disabled list on Tuesday, when Carlos Zambrano (7-4, 3.35 ERA) is activated. Zambrano, out with back spasms, will open the homestand against the Washington Nationals.

"Hopefully, he'll give us a lift," Piniella said.

Carrie Muskat is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.