Major League Baseball and the MLB Players Association are discussing major changes to the on-field game and economic landscape of the sport in the middle of a collective bargaining agreement, according to sources.

A wide range of topics are being discussed including a three-batter minimum for pitchers, universal designated hitter, one trade deadline before the All-Star break and a 20-second pitch clock.

Owners meetings are set to begin this week. It remains unclear whether any significant changes will come of the talks.