It seems G.G. Sato had both elbows and his left shoulder cleaned out today. Sato was feeling pain while swinging the bat and played in his last Ni-gun game on 8/29.
Sato had a slow start this year and also struggled with his conversion from right to left field. The defensive struggles affected his offense and Sato was ultimately demoted to Ni-gun on 7/1 (he was batting .204 with 6 homers, 19 RBI, and a .596 OPS).
Seems part of the reason why he developed the pains was because he built up his body too much.