Juri Hara was taken off the active roster today with some tightness in the right side of his back. The Yakult Swallows are expecting the tightness to go away within a few days.
Source: Sanspo 8/6/2017
[UPDATE 8/15 @ 8:18am]
Hara is expected to return to the active roster in time for a start on August 16 against the Yomiuri Giants. He told reporters on August 14 that his back felt fine.
Source: Sponichi 8/15/2017