Rivero (hand) will begin a rehab assignment with Triple-A Salt Lake on Friday.
Rivero suffered a left hamate fracture June 10 and has experienced some setbacks in his recovery after initially beginning a rehab assignment last month. The 27-year-old backstop has slashed .245/.286/.283 with a pair of doubles, eight RBI, five runs scored and a 3:12 BB:K across 57 plate appearances with the Halos this season.