Zach Putnam hits DL; Daniel Webb takes his place

Dennis Wierzbicki-USA TODAY SportsGroin strain alters White Sox bullpen just a few days before rosters are allowed to expand

In what could be the final disabled list stint of the season, the White Sox placed Zach Putnam on the 15-day DL retroactive to Thursday with a strained right groin.

In his place, they reinstated Daniel Webb, who completed a rehab assignment in Charlotte after going on the disabled list himself with what was described as "a mild right back strain."

Putnam had been trying to work through the groin injury over the last week, as he tweaked it while warming up in the Aug. 22 game against Seattle. His appearance on Wednesday was his first since Aug. 19, and while he threw only…