Beal exited with 5 minutes, 50 seconds remaining in the third quarter. The Wizards trailed 89-60 when Beal left, and Brooks said the team opted to leave him on the sideline because of the large deficit.
"We'll see how he feels [Friday] and evaluate it," Brooks said. "He wanted to keep playing, but the bottom line is we were down a big number, so it's wise to let him sit out the rest of the game."
Beal had 15 points on 5-for-14 shooting, with two rebounds, two assists and one steal. He is the fifth-leading scorer in the NBA at 28.3 points per game.
The Wizards host the New York Knicks on Saturday.