Controversial Londoner O'Sullivan, 36, announced he would not be taking part in tour events for the foreseeable future, calling the new WPBSA contract "too onerous" and claiming he could not commit to its requirements.
World Snooker released a statement on Tuesday defending the new contracts, saying that they were designed to help the players.
"We would like to make clear that the contract has been put in place in order to protect the interests of the game of snooker for the benefit of the players, broadcasters, sponsors, promoters and most importantly the fans," the statement read.
"Much like those in Golf and Tennis, the contract lays out to the players what is expected of them as professional sportsmen. 98 of the 99 professional tour players have signed the contract.
"Under the terms of the contract, players can choose which events they would like to take part in. However, players may be penalised if they enter events and withdraw from them without a valid reason. This is mirrored across all sports."