According to the Japanese media, Kei saw an elbow specialist doctor in New York after losing in Indian Wells. At the doctor's recommendation, he decided to take at least six weeks off to focus on rest and rehabilitation, the IMG said on Monday.
Also, Kei and his parents will receive instruction from a nutrition specialist to improve his daily diet.
His father told the media that he still has many years ahead of him so it's OK to restart in a better way.
Kei is now targeting French Open for his return.
(This is my very rough translation so please do not quote it anywhere like an official translaton.