White Sox right-hander Reynaldo Lopez landed on the 15-day injured list Thursday with a strained lower back.
The move is retroactive to July 25 for Lopez, who first experienced the back issue during his last appearance Saturday against the Guardians at Guaranteed Rate Field, manager Tony La Russa said Wednesday.
The Sox also sent center fielder Luis Robert to Triple-A Charlotte to begin a rehab assignment. Robert went on the 10-day IL with blurred vision and light-headedness July 22. He exited a game in Minnesota on July 15 in the second inning and missed the rest of the series before going on the IL.
Robert, batting .301/.334/.461 with 12 home runs in 54 games, went 1-for-5 with a single and two strikeouts as the Knights’ designated hitter Thursday.
Lopez is 4-2 with a 2.98 ERA in 37 appearances (one start) this season. He has not allowed a home run. A corresponding roster move will be made Friday before the Sox open a three-game series against the Athletics at home.