Team spokesman Jay Horwitz said Wagner will be examined at the Hospital for Special Surgery in New York on Tuesday. He will undergo an MRI only if it is warranted after the exam.
Wagner has a 2.20 ERA and 48 strikeouts in 41 innings and has blown six saves. While pitching for the National League in last week's All-Star game, Wagner also gave up the tying run to the AL in the eighth inning.
He has 382 career saves, sixth on baseball's career list and third among active pitchers behind Trevor Hoffman (541) and Mariano Rivera (467).
