Gelof (knee) will report to Triple-A Las Vegas on Tuesday to begin a rehab assignment, Martin Gallegos of MLB.com reports.
Gelof has been on the shelf nearly a month due to a knee laceration but has now been cleared for game action. The 26-year-old is expected to require about 20 at-bats in the minors before being cleared to come off the injured list, so he'll likely need about a week with Las Vegas before rejoining the big-league roster.