The suit was filed back in August with 11 golfers from the breakaway LIV series saying the purpose of the action was to “strike down the PGA Tour’s anti-competitive rules and practices that prevent these independent contractor golfers from playing when and where they choose”.
But Ryder Cup star Poulter and six-time Major winner Mickelson are the latest players to withdraw from the lawsuit along with Talor Gooch and Hudson Swafford.
Abraham Ancer, Carlos Ortiz, Pat Perez and Jason Kokrak had already removed their names, leading Bryson DeChambeau, Matt Jones and Peter Uihlein along with LIV Golf taking the action in a case whose trial date is not expected to be heard until January 2024.
A spokesman for LIV Golf said: “Nothing has changed. The merits of the case - the PGA Tour’s anti-competitive conduct - still stand and will be fully tested in court, and we look forward to that.
“LIV stands with the players whom the PGA Tour has treated so poorly but we also recognised that to be successful we no longer need a wide array of players to be on the suit. We have our players’ backs and will press our case against the PGA Tour’s anti-competitive behaviour.”