Dodgers manager Dave Roberts said that Graterol (hamstring) could return from the 15-day injured list as soon as Friday, David Vassegh of AM 570 LA Sports reports.
Graterol will begin a rehab assignment with Triple-A Oklahoma City on Tuesday, and he may require only a couple of appearances with the affiliate before getting the green light to rejoin the Dodgers. The right-hander opened the season on the IL due to right shoulder inflammation before being activated Aug. 5, only to strain his right hamstring in his first appearance of the season for Los Angeles.