Lopez (knee) struck out four and allowed three hits and one walk over four scoreless innings in a rehab start with Triple-A Gwinnett on Sunday.
Lopez made his first rehab appearance since being placed on the 15-day injured list Aug. 2 due to left knee inflammation. The 32-year-old handled a healthy workload in his return to the mound, tossing 35 of his 50 total pitches for strikes. Though it's unclear whether Atlanta intends to clear a spot in the rotation for Lopez upon his return, the club will at least give him the chance to build up as a starter during his rehab assignment. He'll likely make at least one more appearance in the minors prior to being activated.