Kahnle was unavailable for Thursday's win over the Orioles, Bryan Hoch of MLB.com reports.
Manager Aaron Boone said that the team would have an update on Kahnle's status Friday, indicating that there could be an issue that holds the reliever out for an extended period. Kahnle has made just one appearance on the campaign, allowing a hit and a walk in one inning of work against the Nationals on July 26.