The NBA is expected to make an announcement later Thursday.
Chandler, 32, averaged 6.0 points and 4.2 rebounds while playing in 51 games for the Philadelphia 76ers and LA Clippers last season. If suspended, he would be allowed to participate during training camp and play in preseason games for the Nets.
The Nets signed Chandler as a free agent in July, hoping he could bring a veteran presence to their frontcourt rotation.
The 25-game suspension would result in a loss of $582,898 — $23,316 per game — for Chandler.
If suspended, he would start the regular season on the active list and move to the suspension list after the fifth game (Nov. 1), which would allow the Nets, who have 15 guaranteed contracts, to add a 16th player after that game.
Brooklyn plays the following night (Nov. 2) at Detroit.
Chandler would be eligible to be taken off the suspension list for the Dec. 15 game vs. Philadelphia.