DETROIT -- The Yankees are expected to place right-handed relief pitcher Alfredo Aceves on the 15-day disabled list Wednesday due to lingering pain in his lower back.
Aceves, who experienced back pain in spring training and felt it again while pitching Saturday at Fenway Park, suffered a setback while throwing a bullpen session at Comerica Park before the Yankees' 5-4 loss to the Tigers Monday night.
"Ace isn't doing too good,'' Yankees manager Joe Girardi said before Tuesday night's game, which was rained out and rescheduled for Wednesday as part of a day-night doubleheader. "He felt fine until he actually tried to do the movement. He felt it yesterday in the bullpen and we had to shut him down.''
Aceves, who is 3-0 with a 3.00 ERA in 10 relief appearances, said he believed his problem was a bulging disk.
"When I try to throw, it pinches me,'' he said. "I'm trying to play but it's not in my hands. You don't want to pitch that way.''
Aceves, who was scheduled to fly to New York for tests on Wednesday, would be the fourth Yankee to go on the DL so far this year, along with reliever Chan Ho Park, center fielder Curtis Granderson and designated hitter Nick Johnson. The Yankees said they would announce a roster move to replace Aceves Wednesday morning.
Wallace Matthews covers the Yankees for ESPNNewYork.com. Follow him on Twitter.