James was speaking shortly after the Lakers’ 122-97 win against the LA Clippers on Tuesday night.
James, a four-time NBA Most Valuable Player (MVP) winner, hit 26 points, nine assists and eight rebounds as the Lakers strolled to victory.
Doncic, who has had a calf injury since December, watched on from the side of the court alongside his new team-mates.
Speaking before the game, Doncic expressed his shock at his move to the Lakers.
“You can imagine how surprised I was,” he said.
“I had to check if it was April 1. I didn’t really believe it.”
The Lakers expect Doncic to make his debut later this month.