Hooker was diagnosed with a forearm fracture after undergoing tests Monday, Ian Rapoport of NFL Network reports.
The safety left Sunday's loss to the Giants in the fourth quarter and did not return. He seems likely to miss at least two weeks, according to Calvin Watkins of The Dallas Morning News. P.J. Locke and Markquese Bell would be the next two up at safety if Hooker has to sit for an extended period.