Kotaro Kiyomiya hurt his right hand during rookie workouts at the Kamagaya facilities on January 18 — he felt tightness on the outer portion of his right thumb during weight training exercises. He was examined at a hospital in Tokyo today (x-rays and MRI) and diagnosed with a bone contusion on his right thumb.
Kiyomiya’s workouts will be limited for about a week. He will be re-examined on January 26. He should be okay to attend Ichi-gun spring camp.
[UPDATE 1/23 @ 12:15am]
Kiyomiya resumed playing catch on January 22 (maximum distance of twenty meters at sixty to seventy percent). He told reporters he felt no pain and that throwing was never an issue. He is hoping to get the green light to resume hitting workouts after a follow-up examination on January 26.
[UPDATE 1/26 @ 11:18am]
The Fighters announced on January 25 that Kiyomiya was re-examined (MRI) on the same day and cleared to attend spring camp in the United States. Ichi-gun players are scheduled to leave for Arizona on January 28.
Source: Nippon Ham 1/25/2018
[UPDATE 1/28 @ 2:38pm]
Kiyomiya resumed hitting practices on January 27 (soft-toss batting practice).
Source: Daily Sports 1/27/2018
[UPDATE 2/5 @ 4:06pm]
Kiyomiya did not take any batting practice during the first block of spring camp (February 1-3) because his thumb is still not fully healed. He has not taken any batting practice for five consecutive days. He might not do much hitting during the second block of spring camp either. The Fighters are being cautious because they do not want him to suffer any setbacks.
Source: Sponichi 2/5/2018