The Yomiuri Giants announced on August 28 that Arquimedes Caminero returned to the United States for treatment on his right elbow. There is currently no timetable for his return.
[UPDATE 9/12 @ 4:02pm]
The Giants announced that Caminero had surgery to clean his right elbow at a hospital in Miami, Florida. He is expected to return home to the Dominican Republic for rehab work.
Source: Sponichi 9/12/2018