That would put Chris Tillman in line to make Saturday's start, but manager Buck Showalter said the O's could potentially slot back Guthrie to Saturday and give Rick VandenHurk a start at the end of this week, which would push Tillman back to Sunday.
Showalter said nothing is finalized beyond the Red Sox series, which ends with Millwood, and much of what the team does going forward will be about striking a balance between remaining competitive within the division and doing what's best for the Orioles.
"[VandenHurk's] in the mix, [but] we haven't gotten that far yet," Showalter said of this weekend's rotation. "[We will] see how we come out here bullpen-wise. [I] still would like to get him out there for a start."
VandenHurk, a starter his entire career, was acquired at the July 31 non-waiver Trade Deadline from the Marlins in exchange for lefty reliever Will Ohman. He had thrown just five innings out of the bullpen until Matusz exited his start Sept. 13 with an injury, forcing Showalter to turn the game over to the 'pen. VandenHurk made the most of the opportunity, tossing 5 1/3 innings -- a season high for an Orioles reliever -- and allowing only a solo homer.
He also allowed a three-run homer in the ninth inning of Saturday's loss to the Yankees, but the Orioles want to see what VandenHurk can do as a starter given that he is out of options next spring.