Audley Harrison's ring comeback has been postponed after the former Olympic champion was involved in a serious car crash in Florida.
Harrison's defeat to Sprott was the third of his professional career
The 35-year-old was due to appear on the undercard of Clinton Woods' IBF light heavyweight defence against Julio Gonzalez in Sheffield on Saturday.
But after sustaining wrist and shoulder injuries plus a head trauma he has withdrawn from the fight.
Harrison said: "Thank God everyone involved in the crash survived."
The Sydney 2000 super heavyweight gold medallist had just finished training at Buddy McGirt's gymnasium in Vero Beach and was driving with trainer Kelvyn Travis when a car pulled out in front of him.
Both Harrison and the driver of the other car were taken by ambulance to the Indian River Memorial Hospital with non-life threatening injuries but were later released.
Travis also received cuts and bruises in the incident but did not require hospital treatment.
Harrison added: "I'm waiting for the results of the MRI Scan to see if I've ruptured my pectoral muscle in my chest which is currently in a sling, but hope to be back in action once I'm given the all clear to resume training.
"I was feeling buoyant about getting in the ring next week but my hand is so swollen I've been told by the doctor I'm out for four to six weeks."
Harrison has not fought since a spectacular knock-out by fellow Briton Michael Sprott in February when he vowed to fight on as questions arose about his future in the sport.
He was due to face domestic journeyman Paul King in his comeback fight in Sheffield.