Ms Hales who owns Nick Skelton’s former rides Arko and Russel I, has offered William the ride on her up-and-coming horses.
And in partnership with Belgium-based Neil Jones she hopes to buy some older horses to help get William onto Team GB.
William told H&H: “I moved out of Michael’s yard about a month ago and will be going to the Hales’ in the next couple of weeks.
“It’s an exciting move for me. Lisa and John have always been a big supporters of British showjumping.”