This may not be anything serious but www.clevelandbrowns.com reports

OUCH: The Browns suffered another injury to their offensive line when tackle Nat Dorsey rolled his ankle. "We'll know more later on," Crennel said. Dorsey is competing with Kirk Chambers for the starting job on the right side while Ryan Tucker recovers from arthroscopic knee surgery. ... Safety Shawn Mayer (ankle) is still limited, while nose tackle J'Vonne Parker (ankle) is in a boot.