Poole Pirates rider Chris Holder suffered a fractured left hip, fractured left shoulder and fractured right heel in their Elite League meeting at Coventry on Friday night.
The Australian's injuries, sustained in a high speed crash in the last heat, forced the meeting to be abandoned.
The 25-year-old, who was crowned world champion last October, had surgery on his heel on Saturday morning.
He tweeted: "Not in real good shape at the moment, but I'll be back."
Poole team manager Neil Middleditch added: "I love speedway, but sometimes I just hate it.
"Speedy recovery, champ."