Patrick Cantley has expressed his concerns for the future of golf after more breakaways to join the controversial Saudi-backed LIV Golf Invitational Series.

Brooks Koepka is widely reported to be set to leave the PGA Tour and, while there's yet to be official confirmation, it was announced he had withdrawn from the Travelers Championship.

Phil Mickelson, Dustin Johnson, Sergio Garcia, Lee Westwood and Ian Poulter are among those to have signed up to the series, with further additions expected in the near future.

This has resulted in a lot of uncertainty around the future of golf and Cantley has admitted he is concerned.

"Everyone wants to play against the best players in the world and a lot of us are hyper-competitive. That's maybe what drove us to be as good as we are," he told a news conference.

"Anytime there's a potential fracture in the sport, I don't think that's good. You don't see it in any other major sports, where all the talent is in one tour or league. It's definitely a real concern.

"Right now, there's a competition for talent that is going on, you've seen it in lots of businesses, you've seen it in other professional sports from time to time and part of the concern is not knowing what the future will be like.

"It's an uncertain time for golf. If you think about it in the larger business landscape, it's a competition for talent.

"If the PGA Tour wants to remain as the pre-eminent tour for professional golfers, it has to be the best place to play for the best players in the world."