Right fielder Carlos Quentin sprained the AC shoulder joint and is day-to-day for the White Sox.

He was injured Saturday in the first inning when he made a tumbling catch and rolled on his left shoulder. He underwent an MRI exam Sunday morning, and the timetable for his return is uncertain.

''It hurts, but nothing is broken, which is what I thought when it happened,'' Quentin said. ''Hopefully, in the next two or three days, we'll have a better gauge on it.

''They said at least it's not your throwing shoulder, but as a hitter, it's your front shoulder, and that's important.''

Manager Ozzie Guillen hadn't planned to play Quentin for at least several days.

''If he plays the second game [in Anaheim on Wednesday], it's a gift,'' Guillen said.

The Sox already have catcher A.J. Pierzynski and pitcher Philip Humber on the disabled list after the long-term losses of catcher Ramon Castro (broken right hand) and pitcher Tony Pena (elbow surgery). First baseman Paul Konerko continues to be hobbled by a calf bruise that prevents him from playing the field and running.

But Humber has been fine since being hit in the head by a line drive, and Pierzynski (fractured left wrist) already has started playing catch. He will take batting flips Tuesday and Wednesday in Anaheim and batting practice Friday in Seattle.

''I think, as of now, I'll have maybe two rehab games,'' Pierzynski said, one of them possibly catching Humber before he's reinstated. ''So far, so good, and hopefully it continues that way.''