The Japan Professional Baseball Players Association on Friday decided to oppose Nippon Professional Baseball's potential mid-year introduction of the revised guidelines on preventing home plate collisions.
The controversial guideline introduced this season strictly prohibits fielders from remaining in the third-base line as runners approach the plate.
Starting from next week after the all-star break, NPB is looking to base the decisions on whether a fielders' action actually led to a collision.
The JPBPA said although the players agree with the idea of revising, there have not been enough explanations made directly to players and question marks remain over the validity of mid-season alterations.
"We'd like to agree to the new standard once all the players are satisfied," said JPBPA chairman Motohiro Shima, a catcher with the Pacific League's Tohoku Rakuten Golden Eagles.
NPB visited the 12 teams over the past week to explain the reviews to managers and coaches, and will seek consensus on Saturday during its internal rules committee meeting where the JPBPA will convey its opinion.