The news was announced by owners Sunday Racing as they confirmed the five-year-old mare would take her chance at ParisLongchamp on October 3.
Godolphin jockey hit half-century at Lingfield on Monday, reaching the milestone from fewer rides than were needed in any of the three previous seasons.
Tom Marquand was first choice for the up and coming Ed Walker-trained sprinter but Murphy will have the mount as Marquand is required to ride Nahaarr.
The five-year-old mare continued Japan’s domination of Hong Kong’s Queen Elizabeth II Cup when becoming her nation’s sixth winner of the HK$25 million feature.
The lowdown on five key players in the race for the 2021 title: Oisin Murphy, William Buick, Ben Curtis, Hollie Doyle and Tom Marquand.
Champion jockey was due to ride at Lingfield on Friday and Chelmsford on Saturday having served sentence imposed by France Galop.
Britain’s champion jockey, whose three-month cocaine ban ends on March 11, has been booked to ride star filly on World Cup night.
Britain’s champion jockey Oisin Murphy has expressed the hope he can return to ride in Japan in the future after his French cocaine ban.