Shaw strained his back making a play in the field Sunday for Triple-A Iowa and is considered day-to-day, MLB.com reports.
The report from Monday states that Shaw could miss a few days, and he hasn't returned to action yet. Shaw had a slow start to the year, but he is slashing .314/.397/.547 with 14 home runs, 18 steals and a 14.8 percent strikeout rate in his last 64 games across Double-A and Triple-A.