The Major League Baseball Players Association filed a grievance against the Miami Marlins, Oakland Athletics, Pittsburgh Pirates and Tampa Bay Rays for allegedly failing to comply with revenue-sharing rules.
On Tuesday, Marc Topkin of the Tampa Bay Times reported the players' union seeks "some form of compensation for players that were not signed" following a slow free-agent signing period, but the league doesn't believe any wrongdoing has occurred.
"We have received the grievance and believe it has no merit," MLB said in a statement to Topkin.
This article will be updated to provide more information on this story as it becomes available.