Andrew Bogut's life as a Cleveland Cavalier appears to be over barely after it began, with the big Australian needing to be helped from the court with a fracture to his left leg.

Bogut had only been on the court for 58 seconds in his first game with his new team against the Miami Heat on Tuesday (AEDT), when his left leg clipped Okaro White's right leg in an awkward collision early in the second quarter.

Bogut, a former No.1 draft pick, came off second best and was left grimacing in pain on the sidelines before being carried into the rooms by two teammates, unable to put weight on the leg.

He told Cavs staff on the sidelines that he believed his leg was broken and the franchise released a statement later in the day confirming his worst fears.