Andrew Bogut's first game with defending NBA champions the Cleveland Cavaliers resulted in a fractured left tibia.
The Cavaliers confirmed the shattering and potential season-ending injury after veteran big man Bogut's debut lasted less than a minute on Monday.
After undergoing initial X-rays and evaluation, 32-year-old Bogut - who only joined the Cavs last week - will undergo further tests at the Cleveland Clinic.
Under a minute into his bow with the Cavaliers against the Miami Heat, Bogut went down with a left leg injury and had to be helped to the locker room by Tristan Thompson and James Jones.
Bogut - a championship winner with the Golden State Warriors in 2015 - was unable to put any pressure on his leg after colliding with Miami's Okaro White.
Australian Bogut - who has a career average of 10 points, 8.9 rebounds, 2.3 assists and 1.6 blocks, has missed significant time in his career due to injuries. Most recently, he suffered a right knee injury in December when Roy Hibbert fell into his leg.