Harris was injured in the first quarter when he tried to deflect an alley-oop pass and fell to the floor.
The Nets said in the second quarter that Harris, who played for the Mavericks from 2004-08, wouldn't return to the game. He was scoreless in 9:22 after entering the game with a 17.1-point average.
Nets forward Derrick Favors missed the game because of a bruised thigh.
Favors, the former Georgia Tech star selected third overall in the June draft, was injured Tuesday night in a loss at Atlanta.
"It's swollen," Nets coach Avery Johnson said. "No explosiveness right now."
Johnson hopes Favors, averaging 6.5 points and 5.3 rebounds in 22 games, will be able to practice Saturday and return Sunday for a home game against the Los Angeles Lakers.
Also, Mavericks center Tyson Chandler returned to the starting lineup after missing one game due to a stomach ailment. He had 2 points in 22 minutes of playing time.
Information from The Associated Press was used in this report.