"He's down today. He's day-to-day," Yankees manager Joe Girardi said. "He doesn't feel terrible today, but I won't use him and see how he is tomorrow."
Robertson said that he never had a bruise from the hard liner that Joe Mauer smoked off his back on Wednesday, saying that his belt -- which still has the seams from where the ball impacted it -- took the brunt of the damage.
"It's right above that, so I'm guessing that ball he hit off me probably had a little something to do with it," said Robertson, who is wearing a heat pack on his back to keep it loose.