Nelson (back) pitched off a mound at Dodger Stadium on Monday, J.P. Hoornstra of the Los Angeles Daily News reports.
Monday marked the first time Nelson has thrown off a mound since going on the injured list with a left lumbar strain July 9. Though there had been optimism that the right-hander could return to the active roster early this week, it now appears that he'll need more time before he's ready to rejoin the big club.