But first of all, he will have to prove his fertility. Some top racehorses have returned to the course after failing at stud.
"He'll probably have a few test mares early on to see that all is well and he could get them in foal," said former champion jockey Willie Carson, himself a horse breeder.
With an expected annual roster of 100 mares, that could generate at least £10m every year and upwards of £100m during his lifetime.
"All being well, provided he's a fertile horse and his libido's good, he could be covering three mares a day, or even four at peak times. That's quite demanding," said Grimthorpe.