Dull (knee) is scheduled to undergo an MRI on Saturday to determine the extent of his strain, Susan Slusser of the San Francisco Chronicle reports.
Dull said he felt a painful twinge in his knee while throwing a pitch during Friday's game, but ended up completing a scoreless inning of relief. The young right-hander dealt with hamstring and meniscus issues while pitching in college and said this pain is far worse, a disappointing sign for the Oakland bullpen. More information should become available once the examination is completed.