One potential winter carnival star is to race on but another could be headed for a spell after defeats at Doomben on Saturday.

South Australian three-year-old Hucklebuck will press on to the Group Two Queensland Guineas and possibly the Group One Stradbroke after finishing fourth in the Fred Best Classic (1350m).

Jockey Dominic Tourneur said Hucklebuck, who was having his first start since the Australian Guineas in March, raced keenly in the early stages.

Tourneur said he had hoped to get cover trailing Dothraki but when that runner settled to his outside he had to maintain the lead.

"Hucklebuck continued to over-race in the middle stages and it was the reason he weakened over the final 100 metres," Tourneur said.

Trainer Brent Stanley will decide early this week if Melbourne two-year-old Kalabek will stay in Brisbane.

Jockey Nash Rawiller said the filly over-raced badly in the early stages of the Lancaster Handicap in which she was unplaced.

Stanley said it appeared Kalabek was green at her first start going the right-handed direction.

"I will talk to connections about spelling the filly and we will make up our mind early this week," he said.

A veterinary examination of Kalabek showed the filly had a slower than normal post-race recovery rate.

She also appeared to have been galloped on her off hind leg.

Stewards reported Newcastle galloper Slow Pace, who was well beaten in the Doomben Cup appeared to be suffering from the thumps.