Duff will make another of his regular trips to Britain for Saturday's Coral Charge at Sandown.
Co Meath trainer Edward Lynam has won a number of times across the Irish Sea with his sprinter, who finished eighth - beaten just under six lengths - in the Golden Jubilee Stakes at Ascot.
"He'll run, provided we get fast ground," said Lynam. "It wasn't a bad run last time and he has been fine since."
Duff is entered in the next week's Darley July Cup, but Lynam said: "He'd want to be winning on Saturday before we thought about that."
Lynam's charge is one of 11 entries for the Group Three contest, in which Total Gallery, unplaced in the Jersey Stakes, is also likely to take his chance.
Trainer Stan Moore said: "We could do with a little bit of rain, but he's in good form.
"We ran him at Ascot to see if he'd get the seven furlongs but he didn't so we've dropped him back in trip
"He's bred for five furlongs, and won his maiden over that trip, so I'd be hopeful of a big run."