The Kings announced Friday that further examination on Hayes will likely keep him out until February.
Hayes dislocated his shoulder in a 103-100 victory over Milwaukee on Thursday when he reached in and fouled Milwaukee center Drew Gooden in the second quarter. Hayes lay on the floor writhing in pain for a few minutes, the arena so silent that his screams could be heard from the sideline.
The team previously said a heart exam on Hayes showed an abnormality that would require further testing and voided the contract he signed in December. A few days later, the forward-center agreed to a new deal.