A statement on the club's official website confirmed: "The club can announce that Antti Niemi, having been reviewed at the ground by a spinal surgeon, was taken to hospital where he was reviewed by the doctors and was cleared of any spinal cord or spinal column injury.
"Therefore, the injury sustained is believed to be related to the soft tissue - the ligaments and muscles.
"Antti has been released from hospital and is currently not in a neck brace."