Deron Williams reinjured his ankle during the Brooklyn Nets' game against the Charlotte Bobcats last night.
The point guard left the game in the second quarter after tangling with Kemba Walker on a jump shot during the 95-91 defeat.
The team later announced that the 29-year-old, who had missed the team's previous two games, had sprained his ankle.
The Nets face the Minnesota Timberwolves tomorrow.