All-conquering Victorian trainer Darren Weir has a chance to finish a disappointing Brisbane winter on a high note with lightly raced mare Lonhspresso in Tattersall's Tiara.

But Weir admits he is in the dark about whether the consistent mare can take the next step and give him his first Brisbane Group One at Eagle Farm on Saturday.

By anyone's standards Weir has enjoyed a wonderful 2013-2014 and after Wednesday's racing he leads the Australian trainers' premiership on 223 wins for $8.2 million in prize money.

If there is dampener on his season it's been the winter carnival where his stayer Akzar struggled to find his best southern form.

Weir said Lonhspresso deserved a chance at a Group One race but he wondered if she had struck an above-average lot of fillies and mares.

"They look pretty good on paper and we will be aiming for a top-four placing," he said.

"But she is an honest mare and she is nicely drawn.

"She has some class and probably should have won the Group Two Yellowglen (Stakes) during the spring carnival but she just had absolutely no luck."

Lonhspresso won the Group Two Euclase Stakes in Adelaide as a three-year-old and has been racing well in Melbourne where she won the Listed Straight Six at Flemington two runs back.

She then raced during the Swan Hill carnival where she was second in the feature sprint, the Gold Topaz.

The weather will not worry Lonhspresso who has been competitive on all types of surfaces.

"I would prefer it a bit soft but she has won in everything from good to heavy going," Weir said.

Ben Melham will retain the ride and will be aiming for his first Brisbane win.

"Ben knows her and he has been riding well of late," Weir said.

Weir's best win in Queensland was the 2012 Glenlogan Park Stakes with Wealth Princess.