According to an internal document, the PGA Circuit will suspend any future tour players who compete in LIV tournaments.

In a statement, LIV Golf termed the move “vindictive,” adding that it “deepens the distance between the Tour and its members.” The PGA Tour as it stands has suspended 17 players playing in the Saudi-backed LIV Golf event near London, including major title winners Phil Mickelson and Dustin Johnson.

Johnso is one of them however this article talks about his sister.

Dustin Johnson sister: Who is Laurie Johnson?

Laurie Johnson is the sister of the golf star.

Johnson became professional in late 2007, and he won his 2008 PGA Tour card by placing in a tie for 14th place at the December 2007 qualifying school.

Johnson won his first PGA Tour tournament, the Turning Stone Resort Championship in upstate New York, at the close of his rookie season in October 2008.

Four months later, he won his second tournament at the AT&T Pebble Beach National Pro-Am, which was reduced to 54 holes due to high winds and heavy rain. Johnson won by four shots over Mike Weir and by five strokes over Retief Goosen, who played a 74 in the third round. Johnson became the second individual in Masters Tournament history to win the tournament in 2009.