A legal battle could be looming between the PGA Tour and the new LIV Golf Invitational Series after 17 players were suspended by the PGA or were deemed no longer eligible to play in its events after opting to compete in LIV Golf’s first tournament.

Although 10 of the suspended players had already resigned from the PGA Tour, the seven others could appeal their suspensions. One, Ian Poulter, has already said he will, according to an ESPN.com report. The LIV tour or one or more of its players could sue the PGA for antitrust law violations, arguing that the PGA has engaged in monopolistic tactics and that its players are independent contractors.