Fifita stayed on his knees after a tackle from Kurt Mann and and Sauaso Sue in the final minute of the first half. He was attended to by a trainer and left the field for a HIA.
The 32-year-old passed the HIA and returned to the field at the start of the second half, however he came off again five minutes later and did not return.
He was treated by medics on the sideline of Moreton Daily Stadium in Redcliffe.
The Sharks confirmed on Sunday night Fifita was taken to hospital after the game.
