The Nationals will designate Jacob Turner for assignment, according to Chelsea Janes of the Washington Post (via Twitter). His roster spot will be needed for the ascension of Edwin Jackson to take a start today.

Washington also needed to clear active roster space for just-acquired relievers Sean Doolittle and Ryan Madson. That’ll be accomplished by optioning Austin Adams and Trevor Gott, each of whom had come up briefly while the club nailed down that trade.

Turner, 26, has played much the same role the Nats will now ask Jackson to occupy, with one major difference: now, there’s an open rotation spot. Jackson will have the first crack after allowing just one earned run on nine hits in his 20 1/3 innings at Triple-A Syracuse. Assuming he clears waivers and accepts an assignment, Turner will likely remain a major league option as well.