Brian Roberts will be out for at least three weeks with concussion symptoms.
The Orioles' second baseman visited a concussion specialist in Pittsburgh Tuesday.
He has been out since May 16 in Boston, when he suffered concussion symptoms after sliding headfirst into first base in the first inning. Roberts was placed on the new seven-day disabled list for concussions, but likely will be moved to the 15-day disabled list.
The plan now is for Roberts to rest, and Orioles president Andy MacPhail said the leadoff man is "definitely improving."
MacPhail said he is open to alternatives for Roberts' fill-in, which has been Robert Andino on most occasions. Ryan Adams was promoted from Class AAA Norfolk with Roberts and Cesar Izturis on the disabled list.
MacPhail said the roster could "be in flux here for the next week or two."
Less than finding a replacement at second base, the Orioles will have to find a table-setter atop the order. While Roberts wasn't at his best in the season's first six weeks, he's still a capable leadoff hitter. Andino and Felix Pie have both hit in the top spot in order.
For a lineup that has struggled to live up to its above-average expectations, Roberts' absence only puts more pressure on the rest of the veterans.
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