Donna Logan's apprentice was jumping out one of his boss's young horses, who unfortunately played up and stamped his hoof on Yusoff's left leg in the process.
The Malaysian rider hurt his calf muscles, but thankfully nothing is broken and is expected to make his comeback next week.
In the meantime, his six rides have been reallocated as follows:
Race 1 No 12 Boom Almighty: Chin Chee Seng
Race 2 No 10 Pasir Pinji: Shafrizal Saleh
Race 5 No 11 Ping Pong: Hakim Kamaruddin
Race 11 No 2 Good Luck Charm: Hakim Kamaruddin
Race 12 No 11 Lim's Samurai: Chin Chee Seng
Race 14 No 12 Champagne Finale: Hakim Kamaruddin