The six-times champion jockey partners Deep Resolve for Richmond trainer Alan Swinbank in the opening race, division one of the JW Lees MPA Handicap over a mile and a half, and Siege Of Boston for Deborah Sanderson in the five-furlong Brown Shipley Nursery Handicap.
Swinbank said: “He’s riding Deep Resolve for us in the first race.
“Whether it will be a winner or not I don’t know, but we’ll be trying our best.
“He’s ridden a lot of winners for me since I started and we get on very well.
“The beauty about him is you can get a horse and he will tell you a lot about him for next time.
“I don’t know how long he’ll be staying across, but he will be riding a lot of ours when he gets back.”
Fallon, 50, took a break from riding in Britain in May after injuring his foot in the stalls and went over to compete in America when he recovered.