Hans Adielsson admits he is in the dark over whether Buckland will be able to translate his excellent all-weather form to the turf in the Longines Sagaro Stakes at Ascot.
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The five-year-old has been one of the success stories of the season on the all-weather rising from a mark of 70 to 98.
His winning run was brought to end by the narrowest of margins in the Queen's Prize at Kempton last time out, his first defeat in five races.
"All his form is on the all-weather and this is a big step up in class," said Adielsson.
"He's never produced on grass before but there's no reason why he shouldn't, all his improvement has been since his last run on grass so we'll just have to see.
"We'll have a nice day out, anyway, but by the looks of it he should go on grass.
"I'm not too bullish about his chances, we'll just have to see how he gets on.
"It was a shame he lost last time, it was agonising to get so close, but at least he showed he stayed two miles."
George Baker resumes his partnership with Marcus Tregoning's Askar Tau, winner of this race in 2011, and he is hoping for a strong pace.
"He was due to run at Nottingham but didn't make it there but he's won this race in the past," Baker told At The Races.
"He has his own ideas about the game but on a good day he's more than capable of putting up a good performance in this.
"The key to him is a strong pace as he can take a long time to warm up. He loves passing horses and then he can steam home.
"In the Doncaster Cup they went really slow and that didn't suit him at all.
"If there's a strong pace I'm sure he'll give a good account of himself."
Mark Johnston's Sir Graham Wade was most progressive last season but cut no ice on his return at Nottingham when well beaten by Testosterone in the Further Flight Stakes at Nottingham.
"You'd have to say he was disappointing on his first run back," said Johnston.
"I've got to hope really it was just rustiness but he will need to improve whatever as there's strength in depth in this race.
"It's unlikely that he'd head to the Chester Cup after this. If he didn't win I think we'd have to take stock of the situation and work out a plan.
"If he went and won he'd be aimed at the Ascot Gold Cup, with probably another run in the Henry II at Sandown in between."