"I felt better once I started throwing, much quicker than I thought I would," Warren said. "I got my arm back in shape. I'm worried about just getting my reps on the mound and getting back out there."
With the Yankees on the cusp of postseason play, Warren figures to be a welcome addition to a power bullpen anchored by Aroldis Chapman, Dellin Betances, David Robertson, Chad Green and Tommy Kahnle. The 30-year-old is 3-2 with a 2.40 ERA in 45 appearances this season.
"I think it ranks right up there with them, how much depth we have down there in terms of power arms," Warren said. "Basically everybody can go multiple innings. I can take a little burden off these guys, and just whenever they need me, I'm excited to be a part of it."
Outfielder Aaron Hicks (left oblique strain) took five at-bats in simulated action on Saturday morning at the Yankees' player development complex in Tampa, Fla., and he reported no issues. Hicks is expected to rejoin the Yankees during the upcoming homestand.
Bryan Hoch has covered the Yankees for MLB.com since 2007. Follow him on Twitter @bryanhoch and on Facebook. This story was not subject to the approval of Major League Baseball or its clubs.