Major League Baseball has introduced a host of rule changes in recent years, but commissioner Rob Manfred suggested a bigger one may be yet to come.

Appearing on Friday’s edition of “The Dan Patrick Show,” Manfred said that limiting defensive shifts is a frequent topic of conversation for the league’s competition committee.

“A lot of people feel that the extreme shifting that you’re talking about has changed the game in ways that are not positive and it remains a really hot topic in terms of conversation within that committee,” Manfred said, via Bob Nightengale of USA Today.