The Bengals will now have to navigate the rest of the season without the rookie from Rutgers.
He has been placed on injured reserve, after suffering a foot injury in practice on November 28. He was inactive on Sunday against the Chargers.
Sanu’s roster spot will be filled by running back Daniel Herron, who has been elevated from the practice squad. Herron’s spot on the practice squad will be filled by receiver Vidal Hazelton.