Authorized Stretches Legs Derby winner Authorized continued his preparation for next week's Juddmonte International at York with a workout on Newmarket's Al Bahathri gallops.Peter Chapple-Hyam's charge, who was turned over by Notnowcato in the Coral-Eclipse on his latest start, covered seven and a half furlongs with his regular work companion Striving Storm.The Montjeu colt was partnered by Adrian McCarthy but Chapple-Hyam has revealed big-race pilot Frankie Dettori will be down to ride Authorized in his final gallop before York at the end of the week.'That was a real good blow-out and he will be ready by next Tuesday,' said the St Gatien handler.'I will work him once more ? towards the end of the week ? before the race at York. Frankie Dettori will come in and give him a pipe-opener.'I'm happy with the horse ? he is just about where I want him to be,' he told www.peterchapplehyam.co.uk.Authorized is currently 7-4 favourite with Coral for the Juddmonte International next Tuesday.(C) PA Sport