"A fractured left wrist is expected to sideline first baseman Derrek Lee until September.

The Pirates on Saturday placed Lee on the 15-day disabled list, retroactive to Aug. 10, and recalled infielder Josh Harrison from Triple-A Indianapolis.

"The doctor said three or four weeks is the healing process," Lee said. "But if I can withstand it before then, I can go play. I can't give you an exact time frame."

Lee was injured Aug. 3 when Chicago Cubs closer Carlos Marmol hit him with a pitch. Lee played Monday and Tuesday against the San Francisco Giants but sat out the past two games when the pain flared up.

"I was getting nervous because it still feels like it felt on day one," Lee said. "I can't swing the bat. It wasn't matching up with just being a bruise."

Lee had three sets of X-rays and an MRI exam in Pittsburgh that showed no structural damage. The Giants' team doctor re-examined him Wednesday in San Francisco but did not find a break.

Lee underwent a CT scan Friday that discovered the fracture."