Nick Friedell is the Chicago Bulls beat reporter for ESPN Chicago.
Klay Thompson suffered an undisclosed leg injury late in the third quarter.
Thompson was leading the Warriors with 30 points in the game at the time of his injury and finished as their leading scorer.
Toronto went on to close out the Warriors with a 114-110 victory to earn its first championship in franchise history.More news: Eden Hazard successfully passes checkup in Madrid
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According to head coach Steve Kerr, Thompson told him he'd only need "two minutes" of rest before he would be OK to come back.
"But it's just - the way it's gone, I don't know if it's related to five straight seasons of playing 100-plus games and just all the wear and tear, but it's devastating". He laid there in serious pain, and eventually got helped into the back.
Thompson's re-emergence on the floor received a raucous standing ovation from the crowd inside sold-out Oracle Arena. Both players are expected to become free agents. He was later seen with crutches. He then left the game a few seconds later, jogging to the locker room.
The injury news on Klay Thompson could not be worse.