Add Dustin Pedroia to the Red Sox' overpopulated disabled list.

After sitting out Wednesday's game in Oakland because of a jammed right thumb, Pedroia underwent tests yesterday in Boston that revealed a new injury to his thumb. The second baseman is expected to be placed on the 15-day disabled list before tonight's series opener against the Yankees at Fenway Park, according to a major league source, at which point the Red Sox will make a corresponding roster move.

Pedroia missed six games last month with a torn adductor muscle in his thumb. At that time, though, the Red Sox' medical staff concurred that he wouldn't do additional damage to the muscle by playing through the injury.