Clondaw Warrior won the Ascot Stakes at the Royal meeting with the injured Ryan Moore in the saddle and also landed the Guinness Handicap at the Galway Festival in the hands of promising 7lb claimer Jack Kennedy.
The popular Italian had a ride for Ireland’s champion jumps trainer at Glorious Goodwood and with Moore on the sidelines, Mullins was quick to acquire Dettori’s services.
“We had a look at the race and Willie rang me last week,” said Dettori’s agent Ray Cochrane.
“We rode for Willie the other day at Goodwood and he had a few nice entries in there. He asked if he’d ride for him in the race — it’s as simple as that.
“We had nothing in the race and it’s always nice to ride for Willie if you’re available.
“He has a few rides for Willie in the past, but Ryan usually gets them but he’s obviously off at the minute.
“A spare ride for Willie is always worth having.”
Meanwhile, conditions at York eased to good after the widely-predicted rain arrived on the Knavesmire ahead of next week’s four-day festival.
With only one millimetre of precipitation in the past week, the going had tightened up to good to firm, firm in places on Thursday afternoon.
However, the forecast downpour brought 14 millimetres by yesterday afternoon with more due last night.
Once that passes through, the weather is expected to be dry for the next few days ahead of the meeting that starts on Wednesday.