The world No.26 is set to compete at the third LIV Golf event, which will take place at Trump National Golf Club Bedminster later this month.
Casey, 44, will join former Ryder Cup team-mates Lee Westwood, Sergio Garcia, Ian Poulter and Graeme McDowell and some other big names including Phil Mickelson, Dustin Johnson, Brooks Koepka andBryson DeChambeau in playing on the controversial new tour.
A three-time winner on the PGA Tour and 15-time winner on the European Tour, Casey has not played since March due to injury.
"LIV Golf continues to attract the best players in the sport as it builds increasingly competitive fields with each event," LIV Golf chief executive Greg Norman said.
"Paul Casey adds to the growing list of top 50 golfers who are excited to be part of an innovative and entertaining format that is creating something new for golf.
"His proven track record on a global stage adds another exciting piece to the competition as we prepare for Bedminster."
The PGA Tour issued outright bans to all their events for LIV golfers.
The DP World Tour, meanwhile, sanctioned each of the players who played in the Saudi-backed venture's first event in Hertfordshire during June with a fine of 100,000 pounds and banned them from the Scottish Open - a stance which has since prompted the threat of legal action from the golfers.
with Reuters
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