Casey, 44, a 15-time DP World Tour winner from England who has played in five Ryder Cup teams, is ranked No. 26 in the Official World Golf Ranking.
He gives LIV Golf 22 to the top 100 players on the list.
He has been sidelined with a back injury this year and it is unclear whether he will play in the British Open in two weeks.
Casey missed Masters, PGA Championship, and U.S. Open. In fact, he has never played since the WGC-Dell Technologies Match
Casey went public in 2019 by not playing in the first Saudi International tournament, and was approved by the European Tour.
He cited his relationship with UNICEF at the time for missing the tournament.
Casey, who lives in Scottsdale, Ariz., And has won three times on the PGA Tour, later changed his mind. After skipping the Saudi event in 2019 and 2020,
The 44-year-old Casey is ranked 26th in the world, giving LIV 22 of the world's top 100 players.