Chicago White Sox pitcher Jake Peavy has been cleared to work out on a stationary bike and expects to have another MRI soon to determine how his broken rib is healing though it remains unclear when he will resume throwing.

Peavy has been on the disabled list since June 6 with a non-displaced rib fracture on his left side. The initial recovery was projected as four-to-six weeks and Peavy said he believes that remains accurate.

"I think it's too early. When you haven't started throwing a baseball, that's what it's all going to come down to," Peavy said before Thursday's game against the Minnesota Twins. "Until I start doing that I couldn't even guess."

Peavy, who won five of his first six outings, is 6-4 with a 4.30 ERA in 11 starts for the White Sox. He yielded six earned runs in each of his two previous starts before being lifted because of discomfort after throwing 2 1/3 innings June 4 against Seattle.

"At this point anything's encouraging," said manager Robin Ventura. "It's unique in that it's something (where) you can't really exert yourself. He's happy to be doing something which is good."

Meanwhile, Chicago's hitting slump continues.

The White Sox have lost six of their past seven games and 16 of 21. The club has scored four runs or less in 21 of its past 26 games and ranks last in the American League in runs (250) and on-base percentage (.292).

Ventura acknowledged the offensive woes are taking their toll but gave a vote of confidence to hitting coaches Jeff Manto and Harold Baines.