Bruney was breaking to cover first base on an infield single by A.J. Pierzynski in the seventh inning on Tuesday when the reliever slipped and fell on the grass. Bruney was removed after the batter but said he did not feel pain in his foot until he returned to the clubhouse, where he had it checked out by the Yankees' medical staff.
"I was hoping this might be something that goes away real quick, but it's not much better," Bruney said.
Bruney was sent for a MRI exam on Thursday in Chicago after treatment yielded only incremental progress. The results were forwarded on to team physician Dr. Stuart Hershon in New York, and Bruney said he was headed to New York on Friday to see a foot specialist.
Yankees manager Joe Girardi said he planned to speak with general manager Brian Cashman and head trainer Gene Monahan to evaluate if a roster move would be necessary for Bruney.
"You have to deal with it," Girardi said. "It's part of managing."
Bruney is 1-0 with a 1.59 ERA in nine appearances this year, including one emergency start on April 9 at Kansas City. In 11 1/3 innings, he has walked six and struck out 12, allowing seven hits.
"It's definitely frustrating," Bruney said. "No one wants to sit and watch the games. I realized yesterday that there's no way I could ever be a starter. I'd go nuts in here sitting and watching the whole game."
Bryan Hoch is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.