Pedroia sustained a concussion on Saturday when he took a forearm to the head from Tampa Bay Rays infielder Logan Forsythe. He's been out of Boston's lineup since. Red Sox manager John Farrell said Pedroia didn't respond well after taking indoor batting practice on Monday.
"He's still dealing with some of the symptoms,'' said Farrell. "(Monday) when he tried some activity, he didn't feel quite right. It's hard for me to categorize specifically what he's feeling. There are some inconsistencies with his sleep. These are symptoms that are consistent with a concussion and we've got to be cautious with this and go day-to-day.''
Brock Holt has filled in at second base in Pedroia's absence.
Pedroia, 31, is hitting .280 with a .720 OPS and 51 RBI this season.
- Ben Estes